PorousFlowCapillaryPressureVG

van Genuchten capillary pressure

van Genuchten's capillary-pressure relationship (Genuchten, 1980)

or

The effective saturation has been denoted by and is the porepressure, which is the negative of the capillary pressure: . Here and are user-defined parameters. The parameter must satisfy

By default, a logarithmic extension for low liquid phase saturations is implemented. This can be disabled by setting log_extension = false.

Input Parameters

  • alphavan Genuchten parameter alpha. Must be positive

    C++ Type:double

    Controllable:No

    Description:van Genuchten parameter alpha. Must be positive

  • mvan Genuchten exponent m. Must be between 0 and 1, and optimally should be set to >0.5

    C++ Type:double

    Controllable:No

    Description:van Genuchten exponent m. Must be between 0 and 1, and optimally should be set to >0.5

Required Parameters

  • blockThe list of blocks (ids or names) that this object will be applied

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

    Controllable:No

    Description:The list of blocks (ids or names) that this object will be applied

  • log_extensionTrueUse a logarithmic extension for low saturation to avoid capillary pressure going to infinity. Default is true. Set to false if your capillary pressure depends on spatially-dependent variables other than saturation, as the log-extension C++ code for this case has yet to be implemented

    Default:True

    C++ Type:bool

    Controllable:No

    Description:Use a logarithmic extension for low saturation to avoid capillary pressure going to infinity. Default is true. Set to false if your capillary pressure depends on spatially-dependent variables other than saturation, as the log-extension C++ code for this case has yet to be implemented

  • pc_max1e+09Maximum capillary pressure (Pa). Must be > 0. Default is 1e9

    Default:1e+09

    C++ Type:double

    Controllable:No

    Description:Maximum capillary pressure (Pa). Must be > 0. Default is 1e9

  • 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

    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.

  • s_scale1CapillaryPressure = f(Seff * s_scale) - f(s_scale), where f is the van Genuchten expression. Setting s_scale<1 is unusual but sometimes helps fully saturated, 2-phase PP simulations converge as the zero derivative (1/f'(S=1)=0) is removed

    Default:1

    C++ Type:double

    Controllable:No

    Description:CapillaryPressure = f(Seff * s_scale) - f(s_scale), where f is the van Genuchten expression. Setting s_scale<1 is unusual but sometimes helps fully saturated, 2-phase PP simulations converge as the zero derivative (1/f'(S=1)=0) is removed

  • sat_lr0Liquid residual saturation. Must be between 0 and 1. Default is 0

    Default:0

    C++ Type:double

    Controllable:No

    Description:Liquid residual saturation. Must be between 0 and 1. Default is 0

  • 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

    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.

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

    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>

    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

    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

    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

    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

    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

    Controllable:No

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

  • implicitTrueDetermines whether this object is calculated using an implicit or explicit form

    Default:True

    C++ Type:bool

    Controllable:No

    Description:Determines whether this object is calculated using an implicit or explicit form

  • seed0The seed for the master random number generator

    Default:0

    C++ Type:unsigned int

    Controllable:No

    Description:The seed for the master random number generator

  • 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

    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

Input Files

References

  1. M. Th. van Genuchten. A closed for equation for predicting the hydraulic conductivity of unsaturated soils. Soil Sci. Soc., 44:892–898, 1980.[BibTeX]