CoupledTimeDerivative.C

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//* This file is part of the MOOSE framework
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//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
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//* Licensed under LGPL 2.1, please see LICENSE for details
//* https://www.gnu.org/licenses/lgpl-2.1.html

#include "CoupledTimeDerivative.h"

registerMooseObject("MooseApp", CoupledTimeDerivative);

InputParameters
CoupledTimeDerivative::validParams()
{
  InputParameters params = Kernel::validParams();
  params.addClassDescription("Time derivative Kernel that acts on a coupled variable. Weak form: "
                             "$(\\psi_i, \\frac{\\partial v_h}{\\partial t})$.");
  params.addRequiredCoupledVar("v", "Coupled variable");
  return params;
}

CoupledTimeDerivative::CoupledTimeDerivative(const InputParameters & parameters)
  : Kernel(parameters), _v_dot(coupledDot("v")), _dv_dot(coupledDotDu("v")), _v_var(coupled("v"))
{
}

Real
CoupledTimeDerivative::computeQpResidual()
{
  return _test[_i][_qp] * _v_dot[_qp];
}

Real
CoupledTimeDerivative::computeQpJacobian()
{
  return 0.0;
}

Real
CoupledTimeDerivative::computeQpOffDiagJacobian(unsigned int jvar)
{
  if (jvar == _v_var)
    return _test[_i][_qp] * _phi[_j][_qp] * _dv_dot[_qp];

  return 0.0;
}