ImplicitNeumannBC.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 "ImplicitNeumannBC.h"
 
registerMooseObject("NavierStokesApp", ImplicitNeumannBC);
 
template <>
InputParameters
validParams<ImplicitNeumannBC>()
{
  InputParameters params = validParams<IntegratedBC>();
  params.addClassDescription("This class implements a form of the Neumann boundary condition in "
                             "which the boundary term is treated 'implicitly'.");
  return params;
}
 
ImplicitNeumannBC::ImplicitNeumannBC(const InputParameters & parameters) : IntegratedBC(parameters)
{
}
 
Real
ImplicitNeumannBC::computeQpResidual()
{
  return _grad_u[_qp] * _normals[_qp] * _test[_i][_qp];
}
 
Real
ImplicitNeumannBC::computeQpJacobian()
{
  return (_grad_phi[_j][_qp] * _normals[_qp]) * _test[_i][_qp];
}
 
Real
ImplicitNeumannBC::computeQpOffDiagJacobian(unsigned /*jvar*/)
{
  // off-diagonal derivatives are all zero.
  return 0.;
}