MassEigenKernel.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 "MassEigenKernel.h"

registerMooseObject("MooseApp", MassEigenKernel);

InputParameters
MassEigenKernel::validParams()
{
  InputParameters params = EigenKernel::validParams();
  params.addClassDescription(
      "An eigenkernel with weak form $\\lambda(\\psi_i, -u_h \\times coeff)$ where "
      "$\\lambda$ is the eigenvalue.");
  params.addParam<Real>("coefficient", 1.0, "Coefficient multiplying the term");
  return params;
}

MassEigenKernel::MassEigenKernel(const InputParameters & parameters)
  : EigenKernel(parameters), _coef(this->template getParam<Real>("coefficient"))
{
}

Real
MassEigenKernel::computeQpResidual()
{
  return -_coef * _u[_qp] * _test[_i][_qp];
}

Real
MassEigenKernel::computeQpJacobian()
{
  return -_coef * _phi[_j][_qp] * _test[_i][_qp];
}