Diffusion.C

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//* This file is part of the MOOSE framework
//* https://mooseframework.inl.gov
//*
//* 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 "Diffusion.h"

registerMooseObject("MooseApp", Diffusion);

InputParameters
Diffusion::validParams()
{
  InputParameters params = Kernel::validParams();
  params.addClassDescription("The Laplacian operator ($-\\nabla \\cdot \\nabla u$), with the weak "
                             "form of $(\\nabla \\phi_i, \\nabla u_h)$.");
  return params;
}

Diffusion::Diffusion(const InputParameters & parameters) : Kernel(parameters) {}

Real
Diffusion::computeQpResidual()
{
  return _grad_u[_qp] * _grad_test[_i][_qp];
}

Real
Diffusion::computeQpJacobian()
{
  return _grad_phi[_j][_qp] * _grad_test[_i][_qp];
}