Line data    Source code

       1             : //* This file is part of the MOOSE framework
       2             : //* https://mooseframework.inl.gov
       3             : //*
       4             : //* All rights reserved, see COPYRIGHT for full restrictions
       5             : //* https://github.com/idaholab/moose/blob/master/COPYRIGHT
       6             : //*
       7             : //* Licensed under LGPL 2.1, please see LICENSE for details
       8             : //* https://www.gnu.org/licenses/lgpl-2.1.html
       9             : 
      10             : #include "LangevinNoise.h"
      11             : #include "MooseRandom.h"
      12             : 
      13             : registerMooseObject("PhaseFieldApp", LangevinNoise);
      14             : 
      15             : InputParameters
      16          54 : LangevinNoise::validParams()
      17             : {
      18          54 :   InputParameters params = Kernel::validParams();
      19          54 :   params.addClassDescription("Source term for non-conserved Langevin noise");
      20         108 :   params.addRequiredParam<Real>("amplitude", "Amplitude"); // per sqrt(time)");
      21         108 :   params.addParam<MaterialPropertyName>(
      22             :       "multiplier",
      23         108 :       1.0,
      24             :       "Material property to multiply the random numbers with (defaults to 1.0 if omitted)");
      25          54 :   return params;
      26           0 : }
      27          30 : LangevinNoise::LangevinNoise(const InputParameters & parameters)
      28             :   : Kernel(parameters),
      29          30 :     _amplitude(getParam<Real>("amplitude")),
      30          90 :     _multiplier_prop(getMaterialProperty<Real>("multiplier"))
      31             : {
      32          30 : }
      33             : 
      34             : void
      35           0 : LangevinNoise::residualSetup()
      36             : {
      37           0 :   unsigned int rseed = _t_step;
      38             :   MooseRandom::seed(rseed);
      39           0 : }
      40             : 
      41             : Real
      42           0 : LangevinNoise::computeQpResidual()
      43             : {
      44           0 :   return -_test[_i][_qp] * (2.0 * MooseRandom::rand() - 1.0) * _amplitude * _multiplier_prop[_qp];
      45             : }