ElementL2Difference.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 "ElementL2Difference.h"
#include "Function.h"
 
registerMooseObject("MooseApp", ElementL2Difference);
 
InputParameters
ElementL2Difference::validParams()
{
  InputParameters params = ElementIntegralVariablePostprocessor::validParams();
  params.addRequiredCoupledVar("other_variable", "The variable to compare to");
 
  params.addClassDescription("Computes the element-wise L2 difference between the current variable "
                             "and a coupled variable.");
  return params;
}
 
ElementL2Difference::ElementL2Difference(const InputParameters & parameters)
  : ElementIntegralVariablePostprocessor(parameters), _other_var(coupledValue("other_variable"))
{
}
 
Real
ElementL2Difference::getValue() const
{
  return std::sqrt(ElementIntegralPostprocessor::getValue());
}
 
Real
ElementL2Difference::computeQpIntegral()
{
  Real diff = _u[_qp] - _other_var[_qp];
  return diff * diff;
}