DerivativeTwoPhaseMaterial

Two phase material that combines two single phase materials using a switching function.

The simplified two-phase model** uses a single order parameter to switch between the two phases. A global free energy is constructed using a meta material class that combines the phase free energies.

For two phase models the DerivativeTwoPhaseMaterial can be used to combine two phase free energies into a global free energy (which the AllenCahn and Cahn-Hilliard kernels use to evolve the system) as

Input Parameters

  • etaOrder parameter

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

    Controllable:No

    Description:Order parameter

  • fa_namePhase A material (at eta=0)

    C++ Type:MaterialPropertyName

    Controllable:No

    Description:Phase A material (at eta=0)

  • fb_namePhase A material (at eta=1)

    C++ Type:MaterialPropertyName

    Controllable:No

    Description:Phase A material (at eta=1)

Required Parameters

  • W0Energy barrier for the phase transformation from A to B

    Default:0

    C++ Type:double

    Controllable:No

    Description:Energy barrier for the phase transformation from A to B

  • 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

  • boundaryThe list of boundaries (ids or names) from the mesh where this object applies

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

    Controllable:No

    Description:The list of boundaries (ids or names) from the mesh where this object applies

  • computeTrueWhen false, MOOSE will not call compute methods on this material. The user must call computeProperties() after retrieving the MaterialBase via MaterialBasePropertyInterface::getMaterialBase(). Non-computed MaterialBases are not sorted for dependencies.

    Default:True

    C++ Type:bool

    Controllable:No

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

  • 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 computeQpProperties() 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

    Controllable:No

    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 computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps. Evaluations on element qps will be skipped

  • coupled_variablesVector of variable arguments of fa and fb

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

    Controllable:No

    Description:Vector of variable arguments of fa and fb

  • declare_suffixAn optional suffix parameter that can be appended to any declared 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 declared properties. The suffix will be prepended with a '_' character.

  • derivative_order3Maximum order of derivatives taken (2 or 3)

    Default:3

    C++ Type:unsigned int

    Controllable:No

    Description:Maximum order of derivatives taken (2 or 3)

  • displacement_gradientsVector of displacement gradient variables (see Modules/PhaseField/DisplacementGradients action)

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

    Controllable:No

    Description:Vector of displacement gradient variables (see Modules/PhaseField/DisplacementGradients action)

  • ggBarrier Function Material that provides g(eta)

    Default:g

    C++ Type:MaterialPropertyName

    Controllable:No

    Description:Barrier Function Material that provides g(eta)

  • hhSwitching Function Material that provides h(eta)

    Default:h

    C++ Type:MaterialPropertyName

    Controllable:No

    Description:Switching Function Material that provides h(eta)

  • 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.

  • property_nameFName of the parsed material property

    Default:F

    C++ Type:std::string

    Controllable:No

    Description:Name of the parsed material property

Optional Parameters

  • 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.

  • 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

  • output_propertiesList of material properties, from this material, to output (outputs must also be defined to an output type)

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

    Controllable:No

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

  • outputsnone Vector of output names where you would like to restrict the output of variables(s) associated with this object

    Default:none

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

    Controllable:No

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

Note that the phase free energies usually have single well character. The global free energy landscape will however have a double well character in the examples above.

Outputs Parameters