- 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
- downstream_boundaryThe downstream surface (must also be specified in 'boundary' parameter
C++ Type:std::vector<BoundaryName>
Unit:(no unit assumed)
Controllable:No
Description:The downstream surface (must also be specified in 'boundary' parameter
- pressureThe pressure functor. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
C++ Type:MooseFunctorName
Unit:(no unit assumed)
Controllable:No
Description:The pressure functor. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
- upstream_boundaryThe upstream surface (must also be specified in 'boundary' parameter
C++ Type:std::vector<BoundaryName>
Unit:(no unit assumed)
Controllable:No
Description:The upstream surface (must also be specified in 'boundary' parameter
PressureDrop
Computes the pressure drop between an upstream and a downstream boundary.
The convention used is that if the pressure is decreasing from the upstream to downstream boundaries, then the pressure drop is positive.
If using mesh refinement, and if the upstream and downstream boundary are touching, the boundary between the two may not lie within a refined element, on a node inside a refined side.
Using a weighting functor on local pressures
The weighting functor, a vector, is dotted with the normal of the boundary and can help compute more representative pressure drops for the cases of non-constant pressure profiles across a boundary or for handling multiple upstream/downstream boundaries. This is effectively a weighting flux, which should usually be set to a momentum functor so that the effective weighting factor is the local mass flux.
where is the boundary (upstream or downstream) of interest for each pressure evaluation, is the local pressure (on the element side on the boundary for finite volume variables), is the vector weighting functor and is the local element side normal.
Example input syntax
In this example, we measure the pressure drop between the inlet and outlet of a flow channel, as well as between the inlet and a midsection.
(contrib/moose/modules/navier_stokes/test/tests/postprocessors/pressure_drop/drop_insfv.i)Input Parameters
- 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)
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.
- 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.
- weighting_functorA vector functor to compute a flux to weigh the pressure for the pressure average computations. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
C++ Type:MooseFunctorName
Unit:(no unit assumed)
Controllable:No
Description:A vector functor to compute a flux to weigh the pressure for the pressure average computations. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
- weighting_interp_methodupwindThe interpolation to use for the weighting functor.
Default:upwind
C++ Type:MooseEnum
Unit:(no unit assumed)
Controllable:No
Description:The interpolation to use for the weighting functor.
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
- 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
- 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.