VariableGradientMaterial.C

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//* This file is part of the MOOSE framework
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//* 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 "VariableGradientMaterial.h"
 
registerMooseObject("PhaseFieldApp", VariableGradientMaterial);
 
InputParameters
VariableGradientMaterial::validParams()
{
  InputParameters params = Material::validParams();
  params.addClassDescription("Compute the norm of the gradient of a variable");
  params.addCoupledVar("variable", "Variable to compute the gradient magnitude of");
  params.addRequiredParam<MaterialPropertyName>(
      "prop", "Material property to store the gradient magnitude in");
  return params;
}
 
VariableGradientMaterial::VariableGradientMaterial(const InputParameters & parameters)
  : Material(parameters),
    _grad(coupledGradient("variable")),
    _prop(declareProperty<Real>(getParam<MaterialPropertyName>("prop")))
{
}
 
void
VariableGradientMaterial::computeQpProperties()
{
  _prop[_qp] = _grad[_qp].norm();
}