# PorousFlowPermeabilityExponential

This Material calculates the permeability tensor from an exponential function of porosity: k = k_ijk * BB exp(AA phi), where k_ijk is a tensor providing the anisotropy, phi is porosity, and AA and BB are empirical constants. The user can provide input for the function expressed in ln k, log k or exponential forms (see poroperm_function).

A simple porosity-permeability model where where is the porosity, and and are user-defined constant.

Input can be entered in any of three forms depending on the value of poroperm_function

Input format

poroperm_functioninput format
log_k
\ln k
k

The parameters and are then converted to the correct form internally.

## Input Parameters

• AEmpirical constant; see poroperm_function.

C++ Type:double

Options:

Description:Empirical constant; see poroperm_function.

• BEmpirical constant; see poroperm_function.

C++ Type:double

Options:

Description:Empirical constant; see poroperm_function.

• PorousFlowDictatorThe UserObject that holds the list of PorousFlow variable names

C++ Type:UserObjectName

Options:

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

### Required Parameters

Default:False

C++ Type:bool

Options:

• poroperm_functionexp_kForm of the function relating porosity and permeability. The options are: log_k (log k = A phi + B); ln_k (ln k = A phi + B); exp_k (k = B exp(A phi)); where k is permeability, phi is porosity, A and B are empirical constants.

Default:exp_k

C++ Type:MooseEnum

Options:log_k ln_k exp_k

Description:Form of the function relating porosity and permeability. The options are: log_k (log k = A phi + B); ln_k (ln k = A phi + B); exp_k (k = B exp(A phi)); where k is permeability, phi is porosity, A and B are empirical constants.

• 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

Options:

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.

• blockThe list of block ids (SubdomainID) that this object will be applied

C++ Type:std::vector

Options:

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

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

C++ Type:std::vector

Options:

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

• k_anisotropyA tensor to multiply the calculated scalar permeability, in order to obtain anisotropy if required. Defaults to isotropic permeability if not specified.

C++ Type:libMesh::TensorValue

Options:

Description:A tensor to multiply the calculated scalar permeability, in order to obtain anisotropy if required. Defaults to isotropic permeability if not specified.

### 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

Options:

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

Options:

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

Options:

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

Options:

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

Options:

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

Options:

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

Options:

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

Options:NONE ELEMENT SUBDOMAIN

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