SIMPLENonlinearAssembly

Solves the Navier-Stokes equations using the SIMPLENonlinearAssembly algorithm.

Overview

For the overview of the SIMPLE algorithm, please visit SIMPLE.

This executioner implements the same iteration but it uses MOOSE's native residual and Jacobian computing routines to build system matrices and right hand sides. Even though this introduces an overhead in terms of computational speed, it allows the utilization of the same variables, kernels and boundary conditions that are used in the monolithic solvers.

Example Input Syntax

The setup of a problem with the segregated solver in MOOSE is slightly different compared to conventional monolithic solvers. In this section, we highlight the main differences. For setting up a 2D simulation with the SIMPLE algorithm, we add three systems in MOOSE: one for each momentum component and another for the pressure. The different systems can be created within the Problem block:

[Problem]
  nl_sys_names = 'u_system v_system pressure_system'
  previous_nl_solution_required = true
[]

It is visible that we requested that MOOSE keeps previous solution iterates as well. This is necessary to facilitate the relaxation processes mentioned in SIMPLE.

[Variables]
  [u]
    type = INSFVVelocityVariable
    initial_condition = 0.5
    solver_sys = u_system
    two_term_boundary_expansion = false
  []
  [v]
    type = INSFVVelocityVariable
    initial_condition = 0.0
    solver_sys = v_system
    two_term_boundary_expansion = false
  []
  [pressure]
    type = INSFVPressureVariable
    solver_sys = pressure_system
    initial_condition = 0.2
    two_term_boundary_expansion = false
  []
[]

The kernels are then created similarly to the monolithic system, with the exception that now the kernels acting on pressure are slightly different:

[FVKernels]
  [p_diffusion]
    type = FVAnisotropicDiffusion
    variable = pressure
    coeff = "Ainv"
    coeff_interp_method = 'average'
  []

  [p_source]
    type = FVDivergence
    variable = pressure
    vector_field = "HbyA"
    force_boundary_execution = true
  []
[]

By default, the coupling fields corresponding to $A^{-1}H$ and $A^{-1}$ are called HbyA and Ainv, respectively. These fields are generated by INSFVRhieChowInterpolatorSegregated under the hood. This means that we need to add the user object responsible for generating these fields:

[UserObjects]
  [rc]
    type = INSFVRhieChowInterpolatorSegregated
    u = u
    v = v
    pressure = pressure
  []
[]

Next, we add the SIMPLENonlinearAssembly executioner:

[Executioner]
  type = SIMPLENonlinearAssembly
  momentum_l_abs_tol = 1e-14
  pressure_l_abs_tol = 1e-14
  momentum_l_tol = 0
  pressure_l_tol = 0
  rhie_chow_user_object = 'rc'
  momentum_systems = 'u_system v_system'
  pressure_system = 'pressure_system'
  pressure_gradient_tag = ${pressure_tag}
  momentum_equation_relaxation = 0.8
  pressure_variable_relaxation = 0.3
  num_iterations = 150
  pressure_absolute_tolerance = 1e-13
  momentum_absolute_tolerance = 1e-13
  print_fields = false
[]

We see that it has a parameter called "pressure_gradient_tag". This tag needs to be added to the pressure gradient kernels to enable the separation of terms needed in $A^{-1}H$ . This can be easily done as follows in the FVKernels:

[FVKernels]
  [u_pressure]
    type = INSFVMomentumPressure
    variable = u
    momentum_component = 'x'
    pressure = pressure
    extra_vector_tags = ${pressure_tag}
  []

  [v_pressure]
    type = INSFVMomentumPressure
    variable = v
    momentum_component = 'y'
    pressure = pressure
    extra_vector_tags = ${pressure_tag}
  []
[]

Input Parameters

momentum_systemsThe solver system(s) for the momentum equation(s).
C++ Type:std::vector<SolverSystemName>
Unit:(no unit assumed)
Controllable:No
Description:The solver system(s) for the momentum equation(s).
pressure_systemThe solver system for the pressure equation.
C++ Type:SolverSystemName
Unit:(no unit assumed)
Controllable:No
Description:The solver system for the pressure equation.
rhie_chow_user_objectThe rhie-chow user-object
C++ Type:UserObjectName
Unit:(no unit assumed)
Controllable:No
Description:The rhie-chow user-object

Required Parameters

continue_on_max_itsFalseIf solve should continue if maximum number of iterations is hit.
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:If solve should continue if maximum number of iterations is hit.
energy_systemThe solver system for the energy equation.
C++ Type:SolverSystemName
Unit:(no unit assumed)
Controllable:No
Description:The solver system for the energy equation.
num_iterations1000The number of momentum-pressure-(other fields) iterations needed.
Default:1000
C++ Type:unsigned int
Unit:(no unit assumed)
Controllable:No
Description:The number of momentum-pressure-(other fields) iterations needed.
pressure_gradient_tagpressure_momentum_kernelsThe name of the tags associated with the kernels in the momentum equations which are not related to the pressure gradient.
Default:pressure_momentum_kernels
C++ Type:TagName
Unit:(no unit assumed)
Controllable:No
Description:The name of the tags associated with the kernels in the momentum equations which are not related to the pressure gradient.
print_fieldsFalseUse this to print the coupling and solution fields and matrices throughout the iteration.
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Use this to print the coupling and solution fields and matrices throughout the iteration.
solid_energy_systemThe solver system for the solid energy equation.
C++ Type:SolverSystemName
Unit:(no unit assumed)
Controllable:No
Description:The solver system for the solid energy equation.
time0System time
Default:0
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:System time
turbulence_field_min_limitThe lower limit imposed on turbulent quantities. The recommended value for robustness is 1e-8.
C++ Type:std::vector<double>
Unit:(no unit assumed)
Controllable:No
Description:The lower limit imposed on turbulent quantities. The recommended value for robustness is 1e-8.
turbulence_systemsThe solver system(s) for the turbulence equation(s).
C++ Type:std::vector<SolverSystemName>
Unit:(no unit assumed)
Controllable:No
Description:The solver system(s) for the turbulence equation(s).
verboseFalseSet to true to print additional information
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Set to true to print additional information

Optional Parameters

accept_on_max_fixed_point_iterationFalseTrue to treat reaching the maximum number of fixed point iterations as converged.
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:True to treat reaching the maximum number of fixed point iterations as converged.
auto_advanceFalseWhether to automatically advance sub-applications regardless of whether their solve converges, for transient executioners only.
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Whether to automatically advance sub-applications regardless of whether their solve converges, for transient executioners only.
custom_abs_tol1e-50The absolute nonlinear residual to shoot for during fixed point iterations. This check is performed based on postprocessor defined by the custom_pp residual.
Default:1e-50
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The absolute nonlinear residual to shoot for during fixed point iterations. This check is performed based on postprocessor defined by the custom_pp residual.
custom_ppPostprocessor for custom fixed point convergence check.
C++ Type:PostprocessorName
Unit:(no unit assumed)
Controllable:No
Description:Postprocessor for custom fixed point convergence check.
custom_rel_tol1e-08The relative nonlinear residual drop to shoot for during fixed point iterations. This check is performed based on the postprocessor defined by custom_pp residual.
Default:1e-08
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The relative nonlinear residual drop to shoot for during fixed point iterations. This check is performed based on the postprocessor defined by custom_pp residual.
direct_pp_valueFalseTrue to use direct postprocessor value (scaled by value on first iteration). False (default) to use difference in postprocessor value between fixed point iterations.
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:True to use direct postprocessor value (scaled by value on first iteration). False (default) to use difference in postprocessor value between fixed point iterations.
disable_fixed_point_residual_norm_checkFalseDisable the residual norm evaluation thus the three parameters fixed_point_rel_tol, fixed_point_abs_tol and fixed_point_force_norms.
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Disable the residual norm evaluation thus the three parameters fixed_point_rel_tol, fixed_point_abs_tol and fixed_point_force_norms.
fixed_point_abs_tol1e-50The absolute nonlinear residual to shoot for during fixed point iterations. This check is performed based on the main app's nonlinear residual.
Default:1e-50
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The absolute nonlinear residual to shoot for during fixed point iterations. This check is performed based on the main app's nonlinear residual.
fixed_point_algorithmpicardThe fixed point algorithm to converge the sequence of problems.
Default:picard
C++ Type:MooseEnum
Unit:(no unit assumed)
Options:picard, secant, steffensen
Controllable:No
Description:The fixed point algorithm to converge the sequence of problems.
fixed_point_force_normsFalseForce the evaluation of both the TIMESTEP_BEGIN and TIMESTEP_END norms regardless of the existence of active MultiApps with those execute_on flags, default: false.
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Force the evaluation of both the TIMESTEP_BEGIN and TIMESTEP_END norms regardless of the existence of active MultiApps with those execute_on flags, default: false.
fixed_point_max_its1Specifies the maximum number of fixed point iterations.
Default:1
C++ Type:unsigned int
Unit:(no unit assumed)
Controllable:No
Description:Specifies the maximum number of fixed point iterations.
fixed_point_min_its1Specifies the minimum number of fixed point iterations.
Default:1
C++ Type:unsigned int
Unit:(no unit assumed)
Controllable:No
Description:Specifies the minimum number of fixed point iterations.
fixed_point_rel_tol1e-08The relative nonlinear residual drop to shoot for during fixed point iterations. This check is performed based on the main app's nonlinear residual.
Default:1e-08
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The relative nonlinear residual drop to shoot for during fixed point iterations. This check is performed based on the main app's nonlinear residual.
relaxation_factor1Fraction of newly computed value to keep.Set between 0 and 2.
Default:1
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:Fraction of newly computed value to keep.Set between 0 and 2.
transformed_postprocessorsList of main app postprocessors to transform during fixed point iterations
C++ Type:std::vector<PostprocessorName>
Unit:(no unit assumed)
Controllable:No
Description:List of main app postprocessors to transform during fixed point iterations
transformed_variablesList of main app variables to transform during fixed point iterations
C++ Type:std::vector<std::string>
Unit:(no unit assumed)
Controllable:No
Description:List of main app variables to transform during fixed point iterations

Fixed Point Iterations Parameters

control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector<std::string>
Unit:(no unit assumed)
Controllable:No
Description:Adds user-defined labels for accessing object parameters via control logic.
enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Set the enabled status of the MooseObject.
outputsVector of output names where you would like to restrict the output of variables(s) associated with this object
C++ Type:std::vector<OutputName>
Unit:(no unit assumed)
Controllable:No
Description:Vector of output names where you would like to restrict the output of variables(s) associated with this object

Advanced Parameters

energy_absolute_tolerance1e-05The absolute tolerance on the normalized residual of the energy equation.
Default:1e-05
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The absolute tolerance on the normalized residual of the energy equation.
energy_l_abs_tol1e-10The absolute tolerance on the normalized residual in the linear solver of the energy equation.
Default:1e-10
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The absolute tolerance on the normalized residual in the linear solver of the energy equation.
energy_l_max_its10000The maximum allowed iterations in the linear solver of the energy equation.
Default:10000
C++ Type:unsigned int
Unit:(no unit assumed)
Controllable:No
Description:The maximum allowed iterations in the linear solver of the energy equation.
energy_l_tol1e-05The relative tolerance on the normalized residual in the linear solver of the energy equation.
Default:1e-05
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The relative tolerance on the normalized residual in the linear solver of the energy equation.
energy_petsc_optionsSingleton PETSc options for the energy equation
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
Options:-dm_moose_print_embedding, -dm_view, -KSP_CONVERGED_REASON, -KSP_GMRES_MODIFIEDGRAMSCHMIDT, -KSP_MONITOR, -KSP_MONITOR_SNES_LG, -SNES_KSP_EW, -KSP_SNES_EW, -SNES_CONVERGED_REASON, -SNES_KSP, -SNES_LINESEARCH_MONITOR, -SNES_MF, -SNES_MF_OPERATOR, -SNES_MONITOR, -SNES_TEST_DISPLAY, -SNES_VIEW, -SNES_MONITOR_CANCEL
Controllable:No
Description:Singleton PETSc options for the energy equation
energy_petsc_options_inameNames of PETSc name/value pairs for the energy equation
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
Options:-mat_fd_coloring_err, -mat_fd_type, -mat_mffd_type, -pc_asm_overlap, -pc_factor_levels, -pc_factor_mat_ordering_type, -pc_hypre_boomeramg_grid_sweeps_all, -pc_hypre_boomeramg_max_iter, -pc_hypre_boomeramg_strong_threshold, -pc_hypre_type, -pc_type, -sub_pc_type, -KSP_ATOL, -KSP_GMRES_RESTART, -KSP_MAX_IT, -KSP_PC_SIDE, -KSP_RTOL, -KSP_TYPE, -SUB_KSP_TYPE, -SNES_ATOL, -SNES_LINESEARCH_TYPE, -SNES_LS, -SNES_MAX_IT, -SNES_RTOL, -SNES_DIVERGENCE_TOLERANCE, -SNES_TYPE
Controllable:No
Description:Names of PETSc name/value pairs for the energy equation
energy_petsc_options_valueValues of PETSc name/value pairs (must correspond with "petsc_options_iname" for the energy equation
C++ Type:std::vector<std::string>
Unit:(no unit assumed)
Controllable:No
Description:Values of PETSc name/value pairs (must correspond with "petsc_options_iname" for the energy equation

Energy Equation Parameters

energy_equation_relaxation1The relaxation which should be used for the energy equation. (=1 for no relaxation, diagonal dominance will still be enforced)
Default:1
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The relaxation which should be used for the energy equation. (=1 for no relaxation, diagonal dominance will still be enforced)
turbulence_equation_relaxationThe relaxation which should be used for the turbulence equations equations. (=1 for no relaxation, diagonal dominance will still be enforced)
C++ Type:std::vector<double>
Unit:(no unit assumed)
Controllable:No
Description:The relaxation which should be used for the turbulence equations equations. (=1 for no relaxation, diagonal dominance will still be enforced)

Relaxation Parameters

max_xfem_update4294967295Maximum number of times to update XFEM crack topology in a step due to evolving cracks
Default:4294967295
C++ Type:unsigned int
Unit:(no unit assumed)
Controllable:No
Description:Maximum number of times to update XFEM crack topology in a step due to evolving cracks
update_xfem_at_timestep_beginFalseShould XFEM update the mesh at the beginning of the timestep
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:Should XFEM update the mesh at the beginning of the timestep

Xfem Fixed Point Iterations Parameters

momentum_absolute_tolerance1e-05The absolute tolerance on the normalized residual of the momentum equation.
Default:1e-05
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The absolute tolerance on the normalized residual of the momentum equation.
momentum_equation_relaxation1The relaxation which should be used for the momentum equation. (=1 for no relaxation, diagonal dominance will still be enforced)
Default:1
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The relaxation which should be used for the momentum equation. (=1 for no relaxation, diagonal dominance will still be enforced)
momentum_l_abs_tol1e-50The absolute tolerance on the normalized residual in the linear solver of the momentum equation.
Default:1e-50
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The absolute tolerance on the normalized residual in the linear solver of the momentum equation.
momentum_l_max_its10000The maximum allowed iterations in the linear solver of the momentum equation.
Default:10000
C++ Type:unsigned int
Unit:(no unit assumed)
Controllable:No
Description:The maximum allowed iterations in the linear solver of the momentum equation.
momentum_l_tol1e-05The relative tolerance on the normalized residual in the linear solver of the momentum equation.
Default:1e-05
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The relative tolerance on the normalized residual in the linear solver of the momentum equation.
momentum_petsc_optionsSingleton PETSc options for the momentum equation
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
Options:-dm_moose_print_embedding, -dm_view, -KSP_CONVERGED_REASON, -KSP_GMRES_MODIFIEDGRAMSCHMIDT, -KSP_MONITOR, -KSP_MONITOR_SNES_LG, -SNES_KSP_EW, -KSP_SNES_EW, -SNES_CONVERGED_REASON, -SNES_KSP, -SNES_LINESEARCH_MONITOR, -SNES_MF, -SNES_MF_OPERATOR, -SNES_MONITOR, -SNES_TEST_DISPLAY, -SNES_VIEW, -SNES_MONITOR_CANCEL
Controllable:No
Description:Singleton PETSc options for the momentum equation
momentum_petsc_options_inameNames of PETSc name/value pairs for the momentum equation
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
Options:-mat_fd_coloring_err, -mat_fd_type, -mat_mffd_type, -pc_asm_overlap, -pc_factor_levels, -pc_factor_mat_ordering_type, -pc_hypre_boomeramg_grid_sweeps_all, -pc_hypre_boomeramg_max_iter, -pc_hypre_boomeramg_strong_threshold, -pc_hypre_type, -pc_type, -sub_pc_type, -KSP_ATOL, -KSP_GMRES_RESTART, -KSP_MAX_IT, -KSP_PC_SIDE, -KSP_RTOL, -KSP_TYPE, -SUB_KSP_TYPE, -SNES_ATOL, -SNES_LINESEARCH_TYPE, -SNES_LS, -SNES_MAX_IT, -SNES_RTOL, -SNES_DIVERGENCE_TOLERANCE, -SNES_TYPE
Controllable:No
Description:Names of PETSc name/value pairs for the momentum equation
momentum_petsc_options_valueValues of PETSc name/value pairs (must correspond with "petsc_options_iname" for the momentum equation
C++ Type:std::vector<std::string>
Unit:(no unit assumed)
Controllable:No
Description:Values of PETSc name/value pairs (must correspond with "petsc_options_iname" for the momentum equation

Momentum Equation Parameters

passive_scalar_absolute_toleranceThe absolute tolerance(s) on the normalized residual(s) of the passive scalar equation(s).
C++ Type:std::vector<double>
Unit:(no unit assumed)
Controllable:No
Description:The absolute tolerance(s) on the normalized residual(s) of the passive scalar equation(s).
passive_scalar_equation_relaxationThe relaxation which should be used for the passive scalar equations. (=1 for no relaxation, diagonal dominance will still be enforced)
C++ Type:std::vector<double>
Unit:(no unit assumed)
Controllable:No
Description:The relaxation which should be used for the passive scalar equations. (=1 for no relaxation, diagonal dominance will still be enforced)
passive_scalar_l_abs_tol1e-10The absolute tolerance on the normalized residual in the linear solver of the passive scalar equation(s).
Default:1e-10
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The absolute tolerance on the normalized residual in the linear solver of the passive scalar equation(s).
passive_scalar_l_max_its10000The maximum allowed iterations in the linear solver of the turbulence equation.
Default:10000
C++ Type:unsigned int
Unit:(no unit assumed)
Controllable:No
Description:The maximum allowed iterations in the linear solver of the turbulence equation.
passive_scalar_l_tol1e-05The relative tolerance on the normalized residual in the linear solver of the passive scalar equation(s).
Default:1e-05
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The relative tolerance on the normalized residual in the linear solver of the passive scalar equation(s).
passive_scalar_petsc_optionsSingleton PETSc options for the passive scalar equation(s)
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
Options:-dm_moose_print_embedding, -dm_view, -KSP_CONVERGED_REASON, -KSP_GMRES_MODIFIEDGRAMSCHMIDT, -KSP_MONITOR, -KSP_MONITOR_SNES_LG, -SNES_KSP_EW, -KSP_SNES_EW, -SNES_CONVERGED_REASON, -SNES_KSP, -SNES_LINESEARCH_MONITOR, -SNES_MF, -SNES_MF_OPERATOR, -SNES_MONITOR, -SNES_TEST_DISPLAY, -SNES_VIEW, -SNES_MONITOR_CANCEL
Controllable:No
Description:Singleton PETSc options for the passive scalar equation(s)
passive_scalar_petsc_options_inameNames of PETSc name/value pairs for the passive scalar equation(s)
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
Options:-mat_fd_coloring_err, -mat_fd_type, -mat_mffd_type, -pc_asm_overlap, -pc_factor_levels, -pc_factor_mat_ordering_type, -pc_hypre_boomeramg_grid_sweeps_all, -pc_hypre_boomeramg_max_iter, -pc_hypre_boomeramg_strong_threshold, -pc_hypre_type, -pc_type, -sub_pc_type, -KSP_ATOL, -KSP_GMRES_RESTART, -KSP_MAX_IT, -KSP_PC_SIDE, -KSP_RTOL, -KSP_TYPE, -SUB_KSP_TYPE, -SNES_ATOL, -SNES_LINESEARCH_TYPE, -SNES_LS, -SNES_MAX_IT, -SNES_RTOL, -SNES_DIVERGENCE_TOLERANCE, -SNES_TYPE
Controllable:No
Description:Names of PETSc name/value pairs for the passive scalar equation(s)
passive_scalar_petsc_options_valueValues of PETSc name/value pairs (must correspond with "petsc_options_iname" for the passive scalar equation(s)
C++ Type:std::vector<std::string>
Unit:(no unit assumed)
Controllable:No
Description:Values of PETSc name/value pairs (must correspond with "petsc_options_iname" for the passive scalar equation(s)
passive_scalar_systemsThe solver system for each scalar advection equation.
C++ Type:std::vector<SolverSystemName>
Unit:(no unit assumed)
Controllable:No
Description:The solver system for each scalar advection equation.

Passive_Scalar Equation Parameters

pin_pressureFalseIf the pressure field needs to be pinned at a point.
Default:False
C++ Type:bool
Unit:(no unit assumed)
Controllable:No
Description:If the pressure field needs to be pinned at a point.
pressure_pin_pointThe point where the pressure needs to be pinned.
C++ Type:libMesh::Point
Unit:(no unit assumed)
Controllable:No
Description:The point where the pressure needs to be pinned.
pressure_pin_value0The value which needs to be enforced for the pressure.
Default:0
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The value which needs to be enforced for the pressure.

Pressure Pin Parameters

pressure_absolute_tolerance1e-05The absolute tolerance on the normalized residual of the pressure equation.
Default:1e-05
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The absolute tolerance on the normalized residual of the pressure equation.
pressure_l_abs_tol1e-10The absolute tolerance on the normalized residual in the linear solver of the pressure equation.
Default:1e-10
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The absolute tolerance on the normalized residual in the linear solver of the pressure equation.
pressure_l_max_its10000The maximum allowed iterations in the linear solver of the pressure equation.
Default:10000
C++ Type:unsigned int
Unit:(no unit assumed)
Controllable:No
Description:The maximum allowed iterations in the linear solver of the pressure equation.
pressure_l_tol1e-05The relative tolerance on the normalized residual in the linear solver of the pressure equation.
Default:1e-05
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The relative tolerance on the normalized residual in the linear solver of the pressure equation.
pressure_petsc_optionsSingleton PETSc options for the pressure equation
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
Options:-dm_moose_print_embedding, -dm_view, -KSP_CONVERGED_REASON, -KSP_GMRES_MODIFIEDGRAMSCHMIDT, -KSP_MONITOR, -KSP_MONITOR_SNES_LG, -SNES_KSP_EW, -KSP_SNES_EW, -SNES_CONVERGED_REASON, -SNES_KSP, -SNES_LINESEARCH_MONITOR, -SNES_MF, -SNES_MF_OPERATOR, -SNES_MONITOR, -SNES_TEST_DISPLAY, -SNES_VIEW, -SNES_MONITOR_CANCEL
Controllable:No
Description:Singleton PETSc options for the pressure equation
pressure_petsc_options_inameNames of PETSc name/value pairs for the pressure equation
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
Options:-mat_fd_coloring_err, -mat_fd_type, -mat_mffd_type, -pc_asm_overlap, -pc_factor_levels, -pc_factor_mat_ordering_type, -pc_hypre_boomeramg_grid_sweeps_all, -pc_hypre_boomeramg_max_iter, -pc_hypre_boomeramg_strong_threshold, -pc_hypre_type, -pc_type, -sub_pc_type, -KSP_ATOL, -KSP_GMRES_RESTART, -KSP_MAX_IT, -KSP_PC_SIDE, -KSP_RTOL, -KSP_TYPE, -SUB_KSP_TYPE, -SNES_ATOL, -SNES_LINESEARCH_TYPE, -SNES_LS, -SNES_MAX_IT, -SNES_RTOL, -SNES_DIVERGENCE_TOLERANCE, -SNES_TYPE
Controllable:No
Description:Names of PETSc name/value pairs for the pressure equation
pressure_petsc_options_valueValues of PETSc name/value pairs (must correspond with "petsc_options_iname" for the pressure equation
C++ Type:std::vector<std::string>
Unit:(no unit assumed)
Controllable:No
Description:Values of PETSc name/value pairs (must correspond with "petsc_options_iname" for the pressure equation
pressure_variable_relaxation1The relaxation which should be used for the pressure variable (=1 for no relaxation).
Default:1
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The relaxation which should be used for the pressure variable (=1 for no relaxation).

Pressure Equation Parameters

Restart Parameters

solid_energy_absolute_tolerance1e-05The absolute tolerance on the normalized residual of the solid energy equation.
Default:1e-05
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The absolute tolerance on the normalized residual of the solid energy equation.
turbulence_absolute_toleranceThe absolute tolerance(s) on the normalized residual(s) of the turbulence equation(s).
C++ Type:std::vector<double>
Unit:(no unit assumed)
Controllable:No
Description:The absolute tolerance(s) on the normalized residual(s) of the turbulence equation(s).

Iteration Control Parameters

solid_energy_l_abs_tol1e-10The absolute tolerance on the normalized residual in the linear solver of the solid energy equation.
Default:1e-10
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The absolute tolerance on the normalized residual in the linear solver of the solid energy equation.
solid_energy_l_max_its10000The maximum allowed iterations in the linear solver of the solid energy equation.
Default:10000
C++ Type:unsigned int
Unit:(no unit assumed)
Controllable:No
Description:The maximum allowed iterations in the linear solver of the solid energy equation.
solid_energy_l_tol1e-05The relative tolerance on the normalized residual in the linear solver of the solid energy equation.
Default:1e-05
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The relative tolerance on the normalized residual in the linear solver of the solid energy equation.
turbulence_l_abs_tol1e-10The absolute tolerance on the normalized residual in the linear solver of the turbulence equation(s).
Default:1e-10
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The absolute tolerance on the normalized residual in the linear solver of the turbulence equation(s).
turbulence_l_max_its10000The maximum allowed iterations in the linear solver of the turbulence equation(s).
Default:10000
C++ Type:unsigned int
Unit:(no unit assumed)
Controllable:No
Description:The maximum allowed iterations in the linear solver of the turbulence equation(s).
turbulence_l_tol1e-05The relative tolerance on the normalized residual in the linear solver of the turbulence equation(s).
Default:1e-05
C++ Type:double
Unit:(no unit assumed)
Controllable:No
Description:The relative tolerance on the normalized residual in the linear solver of the turbulence equation(s).

Linear Iteration Control Parameters

solid_energy_petsc_optionsSingleton PETSc options for the solid energy equation
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
Options:-dm_moose_print_embedding, -dm_view, -KSP_CONVERGED_REASON, -KSP_GMRES_MODIFIEDGRAMSCHMIDT, -KSP_MONITOR, -KSP_MONITOR_SNES_LG, -SNES_KSP_EW, -KSP_SNES_EW, -SNES_CONVERGED_REASON, -SNES_KSP, -SNES_LINESEARCH_MONITOR, -SNES_MF, -SNES_MF_OPERATOR, -SNES_MONITOR, -SNES_TEST_DISPLAY, -SNES_VIEW, -SNES_MONITOR_CANCEL
Controllable:No
Description:Singleton PETSc options for the solid energy equation
solid_energy_petsc_options_inameNames of PETSc name/value pairs for the solid energy equation
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
Options:-mat_fd_coloring_err, -mat_fd_type, -mat_mffd_type, -pc_asm_overlap, -pc_factor_levels, -pc_factor_mat_ordering_type, -pc_hypre_boomeramg_grid_sweeps_all, -pc_hypre_boomeramg_max_iter, -pc_hypre_boomeramg_strong_threshold, -pc_hypre_type, -pc_type, -sub_pc_type, -KSP_ATOL, -KSP_GMRES_RESTART, -KSP_MAX_IT, -KSP_PC_SIDE, -KSP_RTOL, -KSP_TYPE, -SUB_KSP_TYPE, -SNES_ATOL, -SNES_LINESEARCH_TYPE, -SNES_LS, -SNES_MAX_IT, -SNES_RTOL, -SNES_DIVERGENCE_TOLERANCE, -SNES_TYPE
Controllable:No
Description:Names of PETSc name/value pairs for the solid energy equation
solid_energy_petsc_options_valueValues of PETSc name/value pairs (must correspond with "petsc_options_iname" for the solid energy equation
C++ Type:std::vector<std::string>
Unit:(no unit assumed)
Controllable:No
Description:Values of PETSc name/value pairs (must correspond with "petsc_options_iname" for the solid energy equation
turbulence_petsc_optionsSingleton PETSc options for the turbulence equation(s)
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
Options:-dm_moose_print_embedding, -dm_view, -KSP_CONVERGED_REASON, -KSP_GMRES_MODIFIEDGRAMSCHMIDT, -KSP_MONITOR, -KSP_MONITOR_SNES_LG, -SNES_KSP_EW, -KSP_SNES_EW, -SNES_CONVERGED_REASON, -SNES_KSP, -SNES_LINESEARCH_MONITOR, -SNES_MF, -SNES_MF_OPERATOR, -SNES_MONITOR, -SNES_TEST_DISPLAY, -SNES_VIEW, -SNES_MONITOR_CANCEL
Controllable:No
Description:Singleton PETSc options for the turbulence equation(s)
turbulence_petsc_options_inameNames of PETSc name/value pairs for the turbulence equation(s)
C++ Type:MultiMooseEnum
Unit:(no unit assumed)
Options:-mat_fd_coloring_err, -mat_fd_type, -mat_mffd_type, -pc_asm_overlap, -pc_factor_levels, -pc_factor_mat_ordering_type, -pc_hypre_boomeramg_grid_sweeps_all, -pc_hypre_boomeramg_max_iter, -pc_hypre_boomeramg_strong_threshold, -pc_hypre_type, -pc_type, -sub_pc_type, -KSP_ATOL, -KSP_GMRES_RESTART, -KSP_MAX_IT, -KSP_PC_SIDE, -KSP_RTOL, -KSP_TYPE, -SUB_KSP_TYPE, -SNES_ATOL, -SNES_LINESEARCH_TYPE, -SNES_LS, -SNES_MAX_IT, -SNES_RTOL, -SNES_DIVERGENCE_TOLERANCE, -SNES_TYPE
Controllable:No
Description:Names of PETSc name/value pairs for the turbulence equation(s)
turbulence_petsc_options_valueValues of PETSc name/value pairs (must correspond with "petsc_options_iname" for the turbulence equation
C++ Type:std::vector<std::string>
Unit:(no unit assumed)
Controllable:No
Description:Values of PETSc name/value pairs (must correspond with "petsc_options_iname" for the turbulence equation

Petsc Control Parameters

(contrib/moose/modules/navier_stokes/test/tests/finite_volume/ins/channel-flow/segregated/2d/2d-segregated-velocity.i)

mu = 2.6
rho = 1.0
advected_interp_method = 'average'
velocity_interp_method = 'rc'

pressure_tag = "pressure_grad"

[Mesh]
  [mesh]
    type = CartesianMeshGenerator
    dim = 2
    dx = '0.3'
    dy = '0.3'
    ix = '3'
    iy = '3'
  []
[]

[GlobalParams]
  rhie_chow_user_object = 'rc'
[]

[Problem]
  nl_sys_names = 'u_system v_system pressure_system'
  previous_nl_solution_required = true
[]

[UserObjects]
  [rc]
    type = INSFVRhieChowInterpolatorSegregated
    u = u
    v = v
    pressure = pressure
  []
[]

[Variables]
  [u]
    type = INSFVVelocityVariable
    initial_condition = 0.5
    solver_sys = u_system
    two_term_boundary_expansion = false
  []
  [v]
    type = INSFVVelocityVariable
    initial_condition = 0.0
    solver_sys = v_system
    two_term_boundary_expansion = false
  []
  [pressure]
    type = INSFVPressureVariable
    solver_sys = pressure_system
    initial_condition = 0.2
    two_term_boundary_expansion = false
  []
[]

[FVKernels]
  [u_advection]
    type = INSFVMomentumAdvection
    variable = u
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
    momentum_component = 'x'
  []
  [u_viscosity]
    type = INSFVMomentumDiffusion
    variable = u
    mu = ${mu}
    momentum_component = 'x'
  []
  [u_pressure]
    type = INSFVMomentumPressure
    variable = u
    momentum_component = 'x'
    pressure = pressure
    extra_vector_tags = ${pressure_tag}
  []
  [v_advection]
    type = INSFVMomentumAdvection
    variable = v
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
    momentum_component = 'y'
  []
  [v_viscosity]
    type = INSFVMomentumDiffusion
    variable = v
    mu = ${mu}
    momentum_component = 'y'
  []
  [v_pressure]
    type = INSFVMomentumPressure
    variable = v
    momentum_component = 'y'
    pressure = pressure
    extra_vector_tags = ${pressure_tag}
  []
  [p_diffusion]
    type = FVAnisotropicDiffusion
    variable = pressure
    coeff = "Ainv"
    coeff_interp_method = 'average'
  []
  [p_source]
    type = FVDivergence
    variable = pressure
    vector_field = "HbyA"
    force_boundary_execution = true
  []
[]

[FVBCs]
  [inlet-u]
    type = INSFVInletVelocityBC
    boundary = 'left'
    variable = u
    function = '1.1'
  []
  [inlet-v]
    type = INSFVInletVelocityBC
    boundary = 'left'
    variable = v
    function = '0.0'
  []
  [walls-u]
    type = INSFVNoSlipWallBC
    boundary = 'top bottom'
    variable = u
    function = 0.0
  []
  [walls-v]
    type = INSFVNoSlipWallBC
    boundary = 'top bottom'
    variable = v
    function = 0.0
  []
  [outlet_p]
    type = INSFVOutletPressureBC
    boundary = 'right'
    variable = pressure
    function = 1.4
  []
  [zero-grad-pressure]
    type = FVFunctionNeumannBC
    variable = pressure
    boundary = 'top left bottom'
    function = 0.0
  []
[]

[Executioner]
  type = SIMPLENonlinearAssembly
  momentum_l_abs_tol = 1e-14
  pressure_l_abs_tol = 1e-14
  momentum_l_tol = 0
  pressure_l_tol = 0
  rhie_chow_user_object = 'rc'
  momentum_systems = 'u_system v_system'
  pressure_system = 'pressure_system'
  pressure_gradient_tag = ${pressure_tag}
  momentum_equation_relaxation = 0.8
  pressure_variable_relaxation = 0.3
  num_iterations = 150
  pressure_absolute_tolerance = 1e-13
  momentum_absolute_tolerance = 1e-13
  print_fields = false
[]

[Outputs]
  exodus = true
  csv = false
  perf_graph = false
  print_nonlinear_residuals = false
  print_linear_residuals = true
[]

(contrib/moose/modules/navier_stokes/test/tests/finite_volume/ins/channel-flow/segregated/2d/2d-segregated-velocity.i)

mu = 2.6
rho = 1.0
advected_interp_method = 'average'
velocity_interp_method = 'rc'

pressure_tag = "pressure_grad"

[Mesh]
  [mesh]
    type = CartesianMeshGenerator
    dim = 2
    dx = '0.3'
    dy = '0.3'
    ix = '3'
    iy = '3'
  []
[]

[GlobalParams]
  rhie_chow_user_object = 'rc'
[]

[Problem]
  nl_sys_names = 'u_system v_system pressure_system'
  previous_nl_solution_required = true
[]

[UserObjects]
  [rc]
    type = INSFVRhieChowInterpolatorSegregated
    u = u
    v = v
    pressure = pressure
  []
[]

[Variables]
  [u]
    type = INSFVVelocityVariable
    initial_condition = 0.5
    solver_sys = u_system
    two_term_boundary_expansion = false
  []
  [v]
    type = INSFVVelocityVariable
    initial_condition = 0.0
    solver_sys = v_system
    two_term_boundary_expansion = false
  []
  [pressure]
    type = INSFVPressureVariable
    solver_sys = pressure_system
    initial_condition = 0.2
    two_term_boundary_expansion = false
  []
[]

[FVKernels]
  [u_advection]
    type = INSFVMomentumAdvection
    variable = u
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
    momentum_component = 'x'
  []
  [u_viscosity]
    type = INSFVMomentumDiffusion
    variable = u
    mu = ${mu}
    momentum_component = 'x'
  []
  [u_pressure]
    type = INSFVMomentumPressure
    variable = u
    momentum_component = 'x'
    pressure = pressure
    extra_vector_tags = ${pressure_tag}
  []
  [v_advection]
    type = INSFVMomentumAdvection
    variable = v
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
    momentum_component = 'y'
  []
  [v_viscosity]
    type = INSFVMomentumDiffusion
    variable = v
    mu = ${mu}
    momentum_component = 'y'
  []
  [v_pressure]
    type = INSFVMomentumPressure
    variable = v
    momentum_component = 'y'
    pressure = pressure
    extra_vector_tags = ${pressure_tag}
  []
  [p_diffusion]
    type = FVAnisotropicDiffusion
    variable = pressure
    coeff = "Ainv"
    coeff_interp_method = 'average'
  []
  [p_source]
    type = FVDivergence
    variable = pressure
    vector_field = "HbyA"
    force_boundary_execution = true
  []
[]

[FVBCs]
  [inlet-u]
    type = INSFVInletVelocityBC
    boundary = 'left'
    variable = u
    function = '1.1'
  []
  [inlet-v]
    type = INSFVInletVelocityBC
    boundary = 'left'
    variable = v
    function = '0.0'
  []
  [walls-u]
    type = INSFVNoSlipWallBC
    boundary = 'top bottom'
    variable = u
    function = 0.0
  []
  [walls-v]
    type = INSFVNoSlipWallBC
    boundary = 'top bottom'
    variable = v
    function = 0.0
  []
  [outlet_p]
    type = INSFVOutletPressureBC
    boundary = 'right'
    variable = pressure
    function = 1.4
  []
  [zero-grad-pressure]
    type = FVFunctionNeumannBC
    variable = pressure
    boundary = 'top left bottom'
    function = 0.0
  []
[]

[Executioner]
  type = SIMPLENonlinearAssembly
  momentum_l_abs_tol = 1e-14
  pressure_l_abs_tol = 1e-14
  momentum_l_tol = 0
  pressure_l_tol = 0
  rhie_chow_user_object = 'rc'
  momentum_systems = 'u_system v_system'
  pressure_system = 'pressure_system'
  pressure_gradient_tag = ${pressure_tag}
  momentum_equation_relaxation = 0.8
  pressure_variable_relaxation = 0.3
  num_iterations = 150
  pressure_absolute_tolerance = 1e-13
  momentum_absolute_tolerance = 1e-13
  print_fields = false
[]

[Outputs]
  exodus = true
  csv = false
  perf_graph = false
  print_nonlinear_residuals = false
  print_linear_residuals = true
[]

(contrib/moose/modules/navier_stokes/test/tests/finite_volume/ins/channel-flow/segregated/2d/2d-segregated-velocity.i)

mu = 2.6
rho = 1.0
advected_interp_method = 'average'
velocity_interp_method = 'rc'

pressure_tag = "pressure_grad"

[Mesh]
  [mesh]
    type = CartesianMeshGenerator
    dim = 2
    dx = '0.3'
    dy = '0.3'
    ix = '3'
    iy = '3'
  []
[]

[GlobalParams]
  rhie_chow_user_object = 'rc'
[]

[Problem]
  nl_sys_names = 'u_system v_system pressure_system'
  previous_nl_solution_required = true
[]

[UserObjects]
  [rc]
    type = INSFVRhieChowInterpolatorSegregated
    u = u
    v = v
    pressure = pressure
  []
[]

[Variables]
  [u]
    type = INSFVVelocityVariable
    initial_condition = 0.5
    solver_sys = u_system
    two_term_boundary_expansion = false
  []
  [v]
    type = INSFVVelocityVariable
    initial_condition = 0.0
    solver_sys = v_system
    two_term_boundary_expansion = false
  []
  [pressure]
    type = INSFVPressureVariable
    solver_sys = pressure_system
    initial_condition = 0.2
    two_term_boundary_expansion = false
  []
[]

[FVKernels]
  [u_advection]
    type = INSFVMomentumAdvection
    variable = u
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
    momentum_component = 'x'
  []
  [u_viscosity]
    type = INSFVMomentumDiffusion
    variable = u
    mu = ${mu}
    momentum_component = 'x'
  []
  [u_pressure]
    type = INSFVMomentumPressure
    variable = u
    momentum_component = 'x'
    pressure = pressure
    extra_vector_tags = ${pressure_tag}
  []
  [v_advection]
    type = INSFVMomentumAdvection
    variable = v
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
    momentum_component = 'y'
  []
  [v_viscosity]
    type = INSFVMomentumDiffusion
    variable = v
    mu = ${mu}
    momentum_component = 'y'
  []
  [v_pressure]
    type = INSFVMomentumPressure
    variable = v
    momentum_component = 'y'
    pressure = pressure
    extra_vector_tags = ${pressure_tag}
  []
  [p_diffusion]
    type = FVAnisotropicDiffusion
    variable = pressure
    coeff = "Ainv"
    coeff_interp_method = 'average'
  []
  [p_source]
    type = FVDivergence
    variable = pressure
    vector_field = "HbyA"
    force_boundary_execution = true
  []
[]

[FVBCs]
  [inlet-u]
    type = INSFVInletVelocityBC
    boundary = 'left'
    variable = u
    function = '1.1'
  []
  [inlet-v]
    type = INSFVInletVelocityBC
    boundary = 'left'
    variable = v
    function = '0.0'
  []
  [walls-u]
    type = INSFVNoSlipWallBC
    boundary = 'top bottom'
    variable = u
    function = 0.0
  []
  [walls-v]
    type = INSFVNoSlipWallBC
    boundary = 'top bottom'
    variable = v
    function = 0.0
  []
  [outlet_p]
    type = INSFVOutletPressureBC
    boundary = 'right'
    variable = pressure
    function = 1.4
  []
  [zero-grad-pressure]
    type = FVFunctionNeumannBC
    variable = pressure
    boundary = 'top left bottom'
    function = 0.0
  []
[]

[Executioner]
  type = SIMPLENonlinearAssembly
  momentum_l_abs_tol = 1e-14
  pressure_l_abs_tol = 1e-14
  momentum_l_tol = 0
  pressure_l_tol = 0
  rhie_chow_user_object = 'rc'
  momentum_systems = 'u_system v_system'
  pressure_system = 'pressure_system'
  pressure_gradient_tag = ${pressure_tag}
  momentum_equation_relaxation = 0.8
  pressure_variable_relaxation = 0.3
  num_iterations = 150
  pressure_absolute_tolerance = 1e-13
  momentum_absolute_tolerance = 1e-13
  print_fields = false
[]

[Outputs]
  exodus = true
  csv = false
  perf_graph = false
  print_nonlinear_residuals = false
  print_linear_residuals = true
[]

(contrib/moose/modules/navier_stokes/test/tests/finite_volume/ins/channel-flow/segregated/2d/2d-segregated-velocity.i)

mu = 2.6
rho = 1.0
advected_interp_method = 'average'
velocity_interp_method = 'rc'

pressure_tag = "pressure_grad"

[Mesh]
  [mesh]
    type = CartesianMeshGenerator
    dim = 2
    dx = '0.3'
    dy = '0.3'
    ix = '3'
    iy = '3'
  []
[]

[GlobalParams]
  rhie_chow_user_object = 'rc'
[]

[Problem]
  nl_sys_names = 'u_system v_system pressure_system'
  previous_nl_solution_required = true
[]

[UserObjects]
  [rc]
    type = INSFVRhieChowInterpolatorSegregated
    u = u
    v = v
    pressure = pressure
  []
[]

[Variables]
  [u]
    type = INSFVVelocityVariable
    initial_condition = 0.5
    solver_sys = u_system
    two_term_boundary_expansion = false
  []
  [v]
    type = INSFVVelocityVariable
    initial_condition = 0.0
    solver_sys = v_system
    two_term_boundary_expansion = false
  []
  [pressure]
    type = INSFVPressureVariable
    solver_sys = pressure_system
    initial_condition = 0.2
    two_term_boundary_expansion = false
  []
[]

[FVKernels]
  [u_advection]
    type = INSFVMomentumAdvection
    variable = u
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
    momentum_component = 'x'
  []
  [u_viscosity]
    type = INSFVMomentumDiffusion
    variable = u
    mu = ${mu}
    momentum_component = 'x'
  []
  [u_pressure]
    type = INSFVMomentumPressure
    variable = u
    momentum_component = 'x'
    pressure = pressure
    extra_vector_tags = ${pressure_tag}
  []
  [v_advection]
    type = INSFVMomentumAdvection
    variable = v
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
    momentum_component = 'y'
  []
  [v_viscosity]
    type = INSFVMomentumDiffusion
    variable = v
    mu = ${mu}
    momentum_component = 'y'
  []
  [v_pressure]
    type = INSFVMomentumPressure
    variable = v
    momentum_component = 'y'
    pressure = pressure
    extra_vector_tags = ${pressure_tag}
  []
  [p_diffusion]
    type = FVAnisotropicDiffusion
    variable = pressure
    coeff = "Ainv"
    coeff_interp_method = 'average'
  []
  [p_source]
    type = FVDivergence
    variable = pressure
    vector_field = "HbyA"
    force_boundary_execution = true
  []
[]

[FVBCs]
  [inlet-u]
    type = INSFVInletVelocityBC
    boundary = 'left'
    variable = u
    function = '1.1'
  []
  [inlet-v]
    type = INSFVInletVelocityBC
    boundary = 'left'
    variable = v
    function = '0.0'
  []
  [walls-u]
    type = INSFVNoSlipWallBC
    boundary = 'top bottom'
    variable = u
    function = 0.0
  []
  [walls-v]
    type = INSFVNoSlipWallBC
    boundary = 'top bottom'
    variable = v
    function = 0.0
  []
  [outlet_p]
    type = INSFVOutletPressureBC
    boundary = 'right'
    variable = pressure
    function = 1.4
  []
  [zero-grad-pressure]
    type = FVFunctionNeumannBC
    variable = pressure
    boundary = 'top left bottom'
    function = 0.0
  []
[]

[Executioner]
  type = SIMPLENonlinearAssembly
  momentum_l_abs_tol = 1e-14
  pressure_l_abs_tol = 1e-14
  momentum_l_tol = 0
  pressure_l_tol = 0
  rhie_chow_user_object = 'rc'
  momentum_systems = 'u_system v_system'
  pressure_system = 'pressure_system'
  pressure_gradient_tag = ${pressure_tag}
  momentum_equation_relaxation = 0.8
  pressure_variable_relaxation = 0.3
  num_iterations = 150
  pressure_absolute_tolerance = 1e-13
  momentum_absolute_tolerance = 1e-13
  print_fields = false
[]

[Outputs]
  exodus = true
  csv = false
  perf_graph = false
  print_nonlinear_residuals = false
  print_linear_residuals = true
[]

(contrib/moose/modules/navier_stokes/test/tests/finite_volume/ins/channel-flow/segregated/2d/2d-segregated-velocity.i)

mu = 2.6
rho = 1.0
advected_interp_method = 'average'
velocity_interp_method = 'rc'

pressure_tag = "pressure_grad"

[Mesh]
  [mesh]
    type = CartesianMeshGenerator
    dim = 2
    dx = '0.3'
    dy = '0.3'
    ix = '3'
    iy = '3'
  []
[]

[GlobalParams]
  rhie_chow_user_object = 'rc'
[]

[Problem]
  nl_sys_names = 'u_system v_system pressure_system'
  previous_nl_solution_required = true
[]

[UserObjects]
  [rc]
    type = INSFVRhieChowInterpolatorSegregated
    u = u
    v = v
    pressure = pressure
  []
[]

[Variables]
  [u]
    type = INSFVVelocityVariable
    initial_condition = 0.5
    solver_sys = u_system
    two_term_boundary_expansion = false
  []
  [v]
    type = INSFVVelocityVariable
    initial_condition = 0.0
    solver_sys = v_system
    two_term_boundary_expansion = false
  []
  [pressure]
    type = INSFVPressureVariable
    solver_sys = pressure_system
    initial_condition = 0.2
    two_term_boundary_expansion = false
  []
[]

[FVKernels]
  [u_advection]
    type = INSFVMomentumAdvection
    variable = u
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
    momentum_component = 'x'
  []
  [u_viscosity]
    type = INSFVMomentumDiffusion
    variable = u
    mu = ${mu}
    momentum_component = 'x'
  []
  [u_pressure]
    type = INSFVMomentumPressure
    variable = u
    momentum_component = 'x'
    pressure = pressure
    extra_vector_tags = ${pressure_tag}
  []
  [v_advection]
    type = INSFVMomentumAdvection
    variable = v
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
    momentum_component = 'y'
  []
  [v_viscosity]
    type = INSFVMomentumDiffusion
    variable = v
    mu = ${mu}
    momentum_component = 'y'
  []
  [v_pressure]
    type = INSFVMomentumPressure
    variable = v
    momentum_component = 'y'
    pressure = pressure
    extra_vector_tags = ${pressure_tag}
  []
  [p_diffusion]
    type = FVAnisotropicDiffusion
    variable = pressure
    coeff = "Ainv"
    coeff_interp_method = 'average'
  []
  [p_source]
    type = FVDivergence
    variable = pressure
    vector_field = "HbyA"
    force_boundary_execution = true
  []
[]

[FVBCs]
  [inlet-u]
    type = INSFVInletVelocityBC
    boundary = 'left'
    variable = u
    function = '1.1'
  []
  [inlet-v]
    type = INSFVInletVelocityBC
    boundary = 'left'
    variable = v
    function = '0.0'
  []
  [walls-u]
    type = INSFVNoSlipWallBC
    boundary = 'top bottom'
    variable = u
    function = 0.0
  []
  [walls-v]
    type = INSFVNoSlipWallBC
    boundary = 'top bottom'
    variable = v
    function = 0.0
  []
  [outlet_p]
    type = INSFVOutletPressureBC
    boundary = 'right'
    variable = pressure
    function = 1.4
  []
  [zero-grad-pressure]
    type = FVFunctionNeumannBC
    variable = pressure
    boundary = 'top left bottom'
    function = 0.0
  []
[]

[Executioner]
  type = SIMPLENonlinearAssembly
  momentum_l_abs_tol = 1e-14
  pressure_l_abs_tol = 1e-14
  momentum_l_tol = 0
  pressure_l_tol = 0
  rhie_chow_user_object = 'rc'
  momentum_systems = 'u_system v_system'
  pressure_system = 'pressure_system'
  pressure_gradient_tag = ${pressure_tag}
  momentum_equation_relaxation = 0.8
  pressure_variable_relaxation = 0.3
  num_iterations = 150
  pressure_absolute_tolerance = 1e-13
  momentum_absolute_tolerance = 1e-13
  print_fields = false
[]

[Outputs]
  exodus = true
  csv = false
  perf_graph = false
  print_nonlinear_residuals = false
  print_linear_residuals = true
[]

(contrib/moose/modules/navier_stokes/test/tests/finite_volume/ins/channel-flow/segregated/2d/2d-segregated-velocity.i)

mu = 2.6
rho = 1.0
advected_interp_method = 'average'
velocity_interp_method = 'rc'

pressure_tag = "pressure_grad"

[Mesh]
  [mesh]
    type = CartesianMeshGenerator
    dim = 2
    dx = '0.3'
    dy = '0.3'
    ix = '3'
    iy = '3'
  []
[]

[GlobalParams]
  rhie_chow_user_object = 'rc'
[]

[Problem]
  nl_sys_names = 'u_system v_system pressure_system'
  previous_nl_solution_required = true
[]

[UserObjects]
  [rc]
    type = INSFVRhieChowInterpolatorSegregated
    u = u
    v = v
    pressure = pressure
  []
[]

[Variables]
  [u]
    type = INSFVVelocityVariable
    initial_condition = 0.5
    solver_sys = u_system
    two_term_boundary_expansion = false
  []
  [v]
    type = INSFVVelocityVariable
    initial_condition = 0.0
    solver_sys = v_system
    two_term_boundary_expansion = false
  []
  [pressure]
    type = INSFVPressureVariable
    solver_sys = pressure_system
    initial_condition = 0.2
    two_term_boundary_expansion = false
  []
[]

[FVKernels]
  [u_advection]
    type = INSFVMomentumAdvection
    variable = u
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
    momentum_component = 'x'
  []
  [u_viscosity]
    type = INSFVMomentumDiffusion
    variable = u
    mu = ${mu}
    momentum_component = 'x'
  []
  [u_pressure]
    type = INSFVMomentumPressure
    variable = u
    momentum_component = 'x'
    pressure = pressure
    extra_vector_tags = ${pressure_tag}
  []
  [v_advection]
    type = INSFVMomentumAdvection
    variable = v
    advected_interp_method = ${advected_interp_method}
    velocity_interp_method = ${velocity_interp_method}
    rho = ${rho}
    momentum_component = 'y'
  []
  [v_viscosity]
    type = INSFVMomentumDiffusion
    variable = v
    mu = ${mu}
    momentum_component = 'y'
  []
  [v_pressure]
    type = INSFVMomentumPressure
    variable = v
    momentum_component = 'y'
    pressure = pressure
    extra_vector_tags = ${pressure_tag}
  []
  [p_diffusion]
    type = FVAnisotropicDiffusion
    variable = pressure
    coeff = "Ainv"
    coeff_interp_method = 'average'
  []
  [p_source]
    type = FVDivergence
    variable = pressure
    vector_field = "HbyA"
    force_boundary_execution = true
  []
[]

[FVBCs]
  [inlet-u]
    type = INSFVInletVelocityBC
    boundary = 'left'
    variable = u
    function = '1.1'
  []
  [inlet-v]
    type = INSFVInletVelocityBC
    boundary = 'left'
    variable = v
    function = '0.0'
  []
  [walls-u]
    type = INSFVNoSlipWallBC
    boundary = 'top bottom'
    variable = u
    function = 0.0
  []
  [walls-v]
    type = INSFVNoSlipWallBC
    boundary = 'top bottom'
    variable = v
    function = 0.0
  []
  [outlet_p]
    type = INSFVOutletPressureBC
    boundary = 'right'
    variable = pressure
    function = 1.4
  []
  [zero-grad-pressure]
    type = FVFunctionNeumannBC
    variable = pressure
    boundary = 'top left bottom'
    function = 0.0
  []
[]

[Executioner]
  type = SIMPLENonlinearAssembly
  momentum_l_abs_tol = 1e-14
  pressure_l_abs_tol = 1e-14
  momentum_l_tol = 0
  pressure_l_tol = 0
  rhie_chow_user_object = 'rc'
  momentum_systems = 'u_system v_system'
  pressure_system = 'pressure_system'
  pressure_gradient_tag = ${pressure_tag}
  momentum_equation_relaxation = 0.8
  pressure_variable_relaxation = 0.3
  num_iterations = 150
  pressure_absolute_tolerance = 1e-13
  momentum_absolute_tolerance = 1e-13
  print_fields = false
[]

[Outputs]
  exodus = true
  csv = false
  perf_graph = false
  print_nonlinear_residuals = false
  print_linear_residuals = true
[]

Overview
Example Input Syntax
Input Parameters