Hydride Precipitation AuxKernel

Calculates the hydrides precipitation and dissolution

Description

The HydridePrecipitationAux model calculates the concentration precipitated hydrogen from full hydrides, assuming that the dissolution kinetics are temporarily equivalent to the precipitation kinetics. The terminal solid solubility of hydrogen is calculated following McMinn et al. (2000) as (1) where is the temperature in Kelvin. The precipitation kinetics are taken from Kammenzind et al. (1996) (2)

The concentration of the precipitated hydrogen is calculated as a function of the kinetics, terminal solid solubility of hydrogen, and the user defined maximum precipitated hydrogen. (3) where is the coupled variable for hydrogen in solid solution concentration, is the time step size, and is the maximum hydrogen precipitation concentration. A default value of (4) is used in this material, although the user can select a different value in the input file.

Example Input Syntax


[./cppre] # precipitation/dissolution of hydrogen by OC (for hydrides)
  type = HydridePrecipitationAux
  variable = Cp
  temp = temp
  Css = Css
  execute_on = linear
[../]
(test/tests/hydrogen/hydrogen.i)

Input Parameters

  • variableThe name of the variable that this object applies to

    C++ Type:AuxVariableName

    Description:The name of the variable that this object applies to

  • tempCoupled Temperature

    C++ Type:std::vector

    Description:Coupled Temperature

  • CssHydrogen in solid solution concentration

    C++ Type:std::vector

    Description:Hydrogen in solid solution concentration

Required Parameters

  • execute_onLINEARThe list of flag(s) indicating when this object should be executed, the available options include NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, FINAL, CUSTOM.

    Default:LINEAR

    C++ Type:ExecFlagEnum

    Description:The list of flag(s) indicating when this object should be executed, the available options include NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, FINAL, CUSTOM.

  • 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

  • maxCp_value0Maximum value for hydrogen concentration in hydride

    Default:0

    C++ Type:double

    Description:Maximum value for hydrogen concentration in hydride

  • 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

  • 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.

  • enableTrueSet the enabled status of the MooseObject.

    Default:True

    C++ Type:bool

    Description:Set the enabled status of the MooseObject.

  • seed0The seed for the master random number generator

    Default:0

    C++ Type:unsigned int

    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

    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

References

  1. BG Kammenzind, David G Franklin, H Richard Peters, and Walter J Duffin. Hydrogen pickup and redistribution in alpha-annealed Zircaloy-4. ASTM Special Technical Publication, 1295:338–369, 1996.[BibTeX]
  2. Andrew McMinn, Edward C Darby, and John S Schofield. The terminal solid solubility of hydrogen in zirconium alloys. ASTM Special Technical Publication, 1354:173–195, 2000.[BibTeX]