LaplacianSplit.C

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//* This file is part of the MOOSE framework
//* https://www.mooseframework.org
//*
//* All rights reserved, see COPYRIGHT for full restrictions
//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
//*
//* Licensed under LGPL 2.1, please see LICENSE for details
//* https://www.gnu.org/licenses/lgpl-2.1.html
 
#include "LaplacianSplit.h"
 
registerMooseObject("PhaseFieldApp", LaplacianSplit);
 
template <>
InputParameters
validParams<LaplacianSplit>()
{
  InputParameters params = validParams<KernelGrad>();
  params.addClassDescription(
      "Split with a variable that holds the Laplacian of a phase field variable.");
  params.addRequiredCoupledVar("c", "Field variable to take the Laplacian of");
  return params;
}
 
LaplacianSplit::LaplacianSplit(const InputParameters & parameters)
  : KernelGrad(parameters), _var_c(coupled("c")), _grad_c(coupledGradient("c"))
{
}
 
RealGradient
LaplacianSplit::precomputeQpResidual()
{
  return _grad_c[_qp]; // * _grad_test[_i][_qp]
}
 
RealGradient
LaplacianSplit::precomputeQpJacobian()
{
  return 0.0;
}
 
Real
LaplacianSplit::computeQpOffDiagJacobian(unsigned int jvar)
{
  if (jvar == _var_c)
    return _grad_phi[_j][_qp] * _grad_test[_i][_qp];
 
  return 0.0;
}