ADShaftConnectedCompressor1PhaseUserObject

Computes and caches flux and residual vectors for a 1-phase compressor. Also computes compressor torque and delta_p which is passed to the connected shaft

A compressor is a type of volume junction, a ADVolumeJunction1PhaseUserObject. As such its base contribution to the residual and Jacobian is set by this class. An additional contribution to the residual (and Jacobian) is described below:

The additional contribution to the residual of the energy equation is simply the power dissipated in the component:

Re+=(Tfriction+Tdissipation)ωR_e += (T_{friction} + T_{dissipation}) \omega

where TfrictionT_{friction} is the friction torque, TdissipationT_{dissipation} is the dissipation torque and ω\omega is the rotation speed of the compressor.

The additional contribution to the residual of the momentum equation in each direction is:

R=ΔpAdout\vec{R} = \Delta p A \vec{d}_{out}

where Δp\Delta p is the pressure increase across the compressor, AA is the flow area and dout\vec{d}_{out} the outlet direction.

The pressure increase in the compressor is:

Δp=p0in(Rpcomp1.0)\Delta p = p0_{in} * (Rp_{comp} - 1.0)

where p0inp0_{in} is inlet pressure, and RpcompRp_{comp} is the pressure ratio, or the inverse of the pressure ratio if treating the compressor as a turbine.

The user object also provides APIs to retrieve the compressor's:

  • isentropic torque

  • dissipation torque

  • friction torque

  • pressure drop

  • pressure ratio

  • efficiency

  • correct mass flow rate

  • corrected speed

commentnote

This user object is created automatically by the ShaftConnectedCompressor1Phase component, users do not need to add it to an input file.

Input Parameters

  • ACross-sectional area of connected flow channels

    C++ Type:std::vector<VariableName>

    Unit:(no unit assumed)

    Controllable:No

    Description:Cross-sectional area of connected flow channels

  • A_refReference area [m^2]

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Reference area [m^2]

  • KForm loss coefficient [-]

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:Yes

    Description:Form loss coefficient [-]

  • Rp_functionsFunctions of pressure ratio versus relative corrected flow. Each function is for a different, constant relative corrected speed. The order of function names should correspond to the order of speeds in the `speeds` parameter [-]

    C++ Type:std::vector<FunctionName>

    Unit:(no unit assumed)

    Controllable:No

    Description:Functions of pressure ratio versus relative corrected flow. Each function is for a different, constant relative corrected speed. The order of function names should correspond to the order of speeds in the `speeds` parameter [-]

  • boundaryThe list of boundary IDs from the mesh where this object applies

    C++ Type:std::vector<BoundaryName>

    Unit:(no unit assumed)

    Controllable:No

    Description:The list of boundary IDs from the mesh where this object applies

  • c0_ratedRated compressor inlet stagnation sound speed [m/s]

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Rated compressor inlet stagnation sound speed [m/s]

  • compressor_nameName of the instance of this compressor component

    C++ Type:std::string

    Unit:(no unit assumed)

    Controllable:No

    Description:Name of the instance of this compressor component

  • di_outDirection of connected outlet

    C++ Type:libMesh::Point

    Unit:(no unit assumed)

    Controllable:No

    Description:Direction of connected outlet

  • eff_functionsFunctions of adiabatic efficiency versus relative corrected flow. Each function is for a different, constant relative corrected speed. The order of function names should correspond to the order of speeds in the `speeds` parameter [-]

    C++ Type:std::vector<FunctionName>

    Unit:(no unit assumed)

    Controllable:No

    Description:Functions of adiabatic efficiency versus relative corrected flow. Each function is for a different, constant relative corrected speed. The order of function names should correspond to the order of speeds in the `speeds` parameter [-]

  • fpFluid properties user object name

    C++ Type:UserObjectName

    Unit:(no unit assumed)

    Controllable:No

    Description:Fluid properties user object name

  • inertia_coeffCompressor inertia coefficients [kg-m^2]

    C++ Type:std::vector<double>

    Unit:(no unit assumed)

    Controllable:No

    Description:Compressor inertia coefficients [kg-m^2]

  • inertia_constCompressor inertia constant [kg-m^2]

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Compressor inertia constant [kg-m^2]

  • max_pressure_ratioMaximum pressure ratio

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Maximum pressure ratio

  • mdot_ratedRated compressor mass flow rate [kg/s]

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Rated compressor mass flow rate [kg/s]

  • min_pressure_ratioMinimum pressure ratio

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Minimum pressure ratio

  • normalsFlow channel outward normals or junction inward normals

    C++ Type:std::vector<double>

    Unit:(no unit assumed)

    Controllable:No

    Description:Flow channel outward normals or junction inward normals

  • numerical_flux_namesThe names of the user objects that compute the numerical flux at each flow channel.

    C++ Type:std::vector<UserObjectName>

    Unit:(no unit assumed)

    Controllable:No

    Description:The names of the user objects that compute the numerical flux at each flow channel.

  • omegaShaft rotational speed [rad/s]

    C++ Type:std::vector<VariableName>

    Unit:(no unit assumed)

    Controllable:No

    Description:Shaft rotational speed [rad/s]

  • omega_ratedRated compressor speed [rad/s]

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Rated compressor speed [rad/s]

  • rho0_ratedRated compressor inlet stagnation fluid density [kg/m^3]

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Rated compressor inlet stagnation fluid density [kg/m^3]

  • rhoArho*A of the connected flow channels

    C++ Type:std::vector<VariableName>

    Unit:(no unit assumed)

    Controllable:No

    Description:rho*A of the connected flow channels

  • rhoEArhoE*A of the connected flow channels

    C++ Type:std::vector<VariableName>

    Unit:(no unit assumed)

    Controllable:No

    Description:rhoE*A of the connected flow channels

  • rhoEVrho*E*V of the junction

    C++ Type:std::vector<VariableName>

    Unit:(no unit assumed)

    Controllable:No

    Description:rho*E*V of the junction

  • rhoVrho*V of the junction

    C++ Type:std::vector<VariableName>

    Unit:(no unit assumed)

    Controllable:No

    Description:rho*V of the junction

  • rhouArhou*A of the connected flow channels

    C++ Type:std::vector<VariableName>

    Unit:(no unit assumed)

    Controllable:No

    Description:rhou*A of the connected flow channels

  • rhouVrho*u*V of the junction

    C++ Type:std::vector<VariableName>

    Unit:(no unit assumed)

    Controllable:No

    Description:rho*u*V of the junction

  • rhovVrho*v*V of the junction

    C++ Type:std::vector<VariableName>

    Unit:(no unit assumed)

    Controllable:No

    Description:rho*v*V of the junction

  • rhowVrho*w*V of the junction

    C++ Type:std::vector<VariableName>

    Unit:(no unit assumed)

    Controllable:No

    Description:rho*w*V of the junction

  • speed_cr_ICompressor speed threshold for inertia [-]

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Compressor speed threshold for inertia [-]

  • speed_cr_frCompressor speed threshold for friction [-]

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Compressor speed threshold for friction [-]

  • speedsRelative corrected speeds. Order of speeds needs correspond to the orders of `Rp_functions` and `eff_functions` [-]

    C++ Type:std::vector<double>

    Unit:(no unit assumed)

    Controllable:No

    Description:Relative corrected speeds. Order of speeds needs correspond to the orders of `Rp_functions` and `eff_functions` [-]

  • tau_fr_coeffFriction coefficients [N-m]

    C++ Type:std::vector<double>

    Unit:(no unit assumed)

    Controllable:No

    Description:Friction coefficients [N-m]

  • tau_fr_constCompressor friction constant [N-m]

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Compressor friction constant [N-m]

  • treat_as_turbineFalseTreat the compressor as a turbine?

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Treat the compressor as a turbine?

  • volumeVolume of the junction

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Volume of the junction

Required Parameters

  • apply_velocity_scalingFalseSet to true to apply the scaling to the normal velocity. See documentation for more information.

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Set to true to apply the scaling to the normal velocity. See documentation for more information.

  • execute_onTIMESTEP_ENDThe list of flag(s) indicating when this object should be executed. For a description of each flag, see https://mooseframework.inl.gov/source/interfaces/SetupInterface.html.

    Default:TIMESTEP_END

    C++ Type:ExecFlagEnum

    Unit:(no unit assumed)

    Options:NONE, INITIAL, LINEAR, NONLINEAR_CONVERGENCE, NONLINEAR, POSTCHECK, TIMESTEP_END, TIMESTEP_BEGIN, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, FINAL, CUSTOM

    Controllable:No

    Description:The list of flag(s) indicating when this object should be executed. For a description of each flag, see https://mooseframework.inl.gov/source/interfaces/SetupInterface.html.

  • inletCompressor inlet

    C++ Type:BoundaryName

    Unit:(no unit assumed)

    Controllable:No

    Description:Compressor inlet

  • junction_subdomain_id65535Junction subdomain ID (required if 'use_scalar_variables' is 'false')

    Default:65535

    C++ Type:unsigned short

    Unit:(no unit assumed)

    Controllable:No

    Description:Junction subdomain ID (required if 'use_scalar_variables' is 'false')

  • outletCompressor outlet

    C++ Type:BoundaryName

    Unit:(no unit assumed)

    Controllable:No

    Description:Compressor outlet

  • processor_idsProcessor IDs owning each connected flow channel element

    C++ Type:std::vector<unsigned int>

    Unit:(no unit assumed)

    Controllable:No

    Description:Processor IDs owning each connected flow channel element

  • prop_getter_suffixAn optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.

    C++ Type:MaterialPropertyName

    Unit:(no unit assumed)

    Controllable:No

    Description:An optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.

  • use_interpolated_stateFalseFor the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:For the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.

  • use_scalar_variablesTrueTrue if the junction variables are scalar variables

    Default:True

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:True if the junction variables are scalar variables

Optional Parameters

  • allow_duplicate_execution_on_initialFalseIn the case where this UserObject is depended upon by an initial condition, allow it to be executed twice during the initial setup (once before the IC and again after mesh adaptivity (if applicable).

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:In the case where this UserObject is depended upon by an initial condition, allow it to be executed twice during the initial setup (once before the IC and again after mesh adaptivity (if applicable).

  • 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:Yes

    Description:Set the enabled status of the MooseObject.

  • execution_order_group0Execution order groups are executed in increasing order (e.g., the lowest number is executed first). Note that negative group numbers may be used to execute groups before the default (0) group. Please refer to the user object documentation for ordering of user object execution within a group.

    Default:0

    C++ Type:int

    Unit:(no unit assumed)

    Controllable:No

    Description:Execution order groups are executed in increasing order (e.g., the lowest number is executed first). Note that negative group numbers may be used to execute groups before the default (0) group. Please refer to the user object documentation for ordering of user object execution within a group.

  • force_postauxFalseForces the UserObject to be executed in POSTAUX

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Forces the UserObject to be executed in POSTAUX

  • force_preauxFalseForces the UserObject to be executed in PREAUX

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Forces the UserObject to be executed in PREAUX

  • force_preicFalseForces the UserObject to be executed in PREIC during initial setup

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Forces the UserObject to be executed in PREIC during initial setup

  • use_displaced_meshFalseWhether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Whether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.

Advanced Parameters