- phaseThe phase number
C++ Type:unsigned int

Description:The phase number

- mThe van Genuchten exponent of the phase
C++ Type:double

Description:The van Genuchten exponent of the phase

- PorousFlowDictatorThe UserObject that holds the list of PorousFlow variable names
C++ Type:UserObjectName

Description:The UserObject that holds the list of PorousFlow variable names

# PorousFlowRelativePermeabilityVG

This Material calculates relative permeability of a phase using the van Genuchten model

The relative permeability of the phase is where the effective saturation is

A *cut* version of the van Genuchten expression is also offered, which is almost definitely indistinguishable experimentally from the original expression: Here the cubic is chosen so that its value and derivative match the van Genuchten expression at , and so that it is unity at .

## Input Parameters

- at_nodesFalseEvaluate Material properties at nodes instead of quadpoints
Default:False

C++ Type:bool

Description:Evaluate Material properties at nodes instead of quadpoints

- computeTrueWhen false, MOOSE will not call compute methods on this material. The user must call computeProperties() after retrieving the Material via MaterialPropertyInterface::getMaterial(). Non-computed Materials are not sorted for dependencies.
Default:True

C++ Type:bool

Description:When false, MOOSE will not call compute methods on this material. The user must call computeProperties() after retrieving the Material via MaterialPropertyInterface::getMaterial(). Non-computed Materials are not sorted for dependencies.

- zero_derivativeFalseEmploy a cubic for seff>seff_turnover that has zero derivative at seff=1
Default:False

C++ Type:bool

Description:Employ a cubic for seff>seff_turnover that has zero derivative at seff=1

- scaling1Relative permeability is multiplied by this factor
Default:1

C++ Type:double

Description:Relative permeability is multiplied by this factor

- sum_s_res0Sum of residual saturations over all phases. Must be between 0 and 1
Default:0

C++ Type:double

Description:Sum of residual saturations over all phases. Must be between 0 and 1

- s_res0The residual saturation of the phase j. Must be between 0 and 1
Default:0

C++ Type:double

Description:The residual saturation of the phase j. Must be between 0 and 1

- boundaryThe list of boundary IDs from the mesh where this boundary condition applies
C++ Type:std::vector

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

- seff_turnover1The relative permeability will be a cubic for seff > seff_turnover. The cubic is chosen so that its derivative and value matche the VG function at seff=seff_turnover
Default:1

C++ Type:double

Description:The relative permeability will be a cubic for seff > seff_turnover. The cubic is chosen so that its derivative and value matche the VG function at seff=seff_turnover

- blockThe list of block ids (SubdomainID) that this object will be applied
C++ Type:std::vector

Description:The list of block ids (SubdomainID) that this object will be applied

### Optional Parameters

- output_propertiesList of material properties, from this material, to output (outputs must also be defined to an output type)
C++ Type:std::vector

Description:List of material properties, from this material, to output (outputs must also be defined to an output type)

- outputsnone Vector of output names were you would like to restrict the output of variables(s) associated with this object
Default:none

C++ Type:std::vector

Description:Vector of output names were you would like to restrict the output of variables(s) associated with this object

### Outputs Parameters

- enableTrueSet the enabled status of the MooseObject.
Default:True

C++ Type:bool

Description:Set the enabled status of the MooseObject.

- 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

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.

- control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector

Description:Adds user-defined labels for accessing object parameters via control logic.

- seed0The seed for the master random number generator
Default:0

C++ Type:unsigned int

Description:The seed for the master random number generator

- implicitTrueDetermines whether this object is calculated using an implicit or explicit form
Default:True

C++ Type:bool

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

- constant_onNONEWhen ELEMENT, MOOSE will only call computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps.When SUBDOMAIN, MOOSE will only call computeSubdomainProperties() for the 0th quadrature point, and then copy that value to the other qps. Evaluations on element qps will be skipped
Default:NONE

C++ Type:MooseEnum

Description:When ELEMENT, MOOSE will only call computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps.When SUBDOMAIN, MOOSE will only call computeSubdomainProperties() for the 0th quadrature point, and then copy that value to the other qps. Evaluations on element qps will be skipped

### Advanced Parameters

## Input Files

- modules/porous_flow/test/tests/jacobian/fflux11.i
- modules/porous_flow/test/tests/capillary_pressure/brooks_corey2.i
- modules/porous_flow/examples/co2_intercomparison/1Dradial/1Dradial.i
- modules/porous_flow/test/tests/broadbridge_white/rd01.i
- modules/porous_flow/test/tests/capillary_pressure/vangenuchten2.i
- modules/porous_flow/test/tests/relperm/vangenuchten2.i
- modules/porous_flow/test/tests/capillary_pressure/vangenuchten3.i
- modules/porous_flow/test/tests/capillary_pressure/brooks_corey1.i
- modules/porous_flow/test/tests/relperm/vangenuchten1.i
- modules/porous_flow/test/tests/broadbridge_white/rd03.i
- modules/porous_flow/test/tests/capillary_pressure/vangenuchten1.i
- modules/porous_flow/test/tests/broadbridge_white/rd02.i