- constant_fluid_bulk_modulusFluid bulk modulus, which is constant for this Material
C++ Type:double

Description:Fluid bulk modulus, which is constant for this Material

- constant_biot_modulusBiot modulus, which is constant for this Material
C++ Type:double

Description:Biot modulus, which is constant for this Material

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

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

- porosity_zeroThe porosity at zero volumetric strain and reference temperature and reference effective porepressure and reference chemistry. This must be a real number or a constant monomial variable (not a linear lagrange or other type of variable)
C++ Type:std::vector

Description:The porosity at zero volumetric strain and reference temperature and reference effective porepressure and reference chemistry. This must be a real number or a constant monomial variable (not a linear lagrange or other type of variable)

# PorousFlowPorosityHMBiotModulus

This Material calculates the porosity for hydro-mechanical simulations, assuming that the Biot modulus and the fluid bulk modulus are both constant. This is useful for comparing with solutions from poroelasticity theory, but is less accurate than PorousFlowPorosity

## 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.

- solid_bulkBulk modulus of the drained porous solid skeleton (only used if fluid=true)
C++ Type:double

Description:Bulk modulus of the drained porous solid skeleton (only used if fluid=true)

- reference_chemistryReference values of the solid mineral concentrations (m^3(precipitate)/m^3(porous material)), entered as a vector (one value per mineral). (Only used if chemical=true)
C++ Type:std::vector

Description:Reference values of the solid mineral concentrations (m^3(precipitate)/m^3(porous material)), entered as a vector (one value per mineral). (Only used if chemical=true)

- strain_at_nearest_qpFalseWhen calculating nodal porosity that depends on strain, use the strain at the nearest quadpoint. This adds a small extra computational burden, and is not necessary for simulations involving only linear lagrange elements. If you set this to true, you will also want to set the same parameter to true for related Kernels and Materials
Default:False

C++ Type:bool

Description:When calculating nodal porosity that depends on strain, use the strain at the nearest quadpoint. This adds a small extra computational burden, and is not necessary for simulations involving only linear lagrange elements. If you set this to true, you will also want to set the same parameter to true for related Kernels and Materials

- initial_mineral_concentrationsInitial mineral concentrations (m^3(precipitate)/m^3(porous material)), entered as a vector (one value per mineral). (Only used if chemical=true)
C++ Type:std::vector

Description:Initial mineral concentrations (m^3(precipitate)/m^3(porous material)), entered as a vector (one value per mineral). (Only used if chemical=true)

- ensure_positiveTrueModify the usual exponential relationships that governs porosity so that porosity is always positive
Default:True

C++ Type:bool

Description:Modify the usual exponential relationships that governs porosity so that porosity is always positive

- thermal_expansion_coeffVolumetric thermal expansion coefficient of the drained porous solid skeleton (only used if thermal=true)
C++ Type:double

Description:Volumetric thermal expansion coefficient of the drained porous solid skeleton (only used if thermal=true)

- fluidTrueIf true, porosity will be a function of effective porepressure
Default:True

C++ Type:bool

Description:If true, porosity will be a function of effective porepressure

- reference_temperatureReference temperature (only used if thermal=true)
C++ Type:std::vector

Description:Reference temperature (only used if thermal=true)

- chemicalFalseIf true, porosity will be a function of precipitate
Default:False

C++ Type:bool

Description:If true, porosity will be a function of precipitate

- thermalFalseIf true, porosity will be a function of temperature
Default:False

C++ Type:bool

Description:If true, porosity will be a function of temperature

- mechanicalTrueIf true, porosity will be a function of total volumetric strain
Default:True

C++ Type:bool

Description:If true, porosity will be a function of total volumetric strain

- 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

- chemical_weightsWhen chemical=true, porosity is a linear combination of the solid mineral concentrations multiplied by these weights. Default=1 for all minerals.
C++ Type:std::vector

Description:When chemical=true, porosity is a linear combination of the solid mineral concentrations multiplied by these weights. Default=1 for all minerals.

- biot_coefficient1Biot coefficient
Default:1

C++ Type:double

Description:Biot coefficient

- reference_porepressureReference porepressure (only used if fluid=true)
C++ Type:std::vector

Description:Reference porepressure (only used if fluid=true)

- 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

- 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

- 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

## Input Files

- modules/porous_flow/test/tests/poro_elasticity/terzaghi_constM.i
- modules/porous_flow/test/tests/poro_elasticity/pp_generation_unconfined_constM.i
- modules/porous_flow/test/tests/poro_elasticity/mandel_constM.i