NullKernel.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 "NullKernel.h"
 
registerMooseObject("MooseApp", NullKernel);
 
InputParameters
NullKernel::validParams()
{
  InputParameters params = Kernel::validParams();
  params.addClassDescription("Kernel that sets a zero residual.");
  params.addParam<Real>(
      "jacobian_fill",
      1e-9,
      "On diagonal Jacobian fill term to retain an invertible matrix for the preconditioner");
  return params;
}
 
NullKernel::NullKernel(const InputParameters & parameters)
  : Kernel(parameters), _jacobian_fill(getParam<Real>("jacobian_fill"))
{
}
 
Real
NullKernel::computeQpResidual()
{
  return 0.0;
}
 
Real
NullKernel::computeQpJacobian()
{
  return _jacobian_fill;
}