RichardsDensityPrimeAux.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
 
//  This post processor returns the derivative of density wrt pressure
//
#include "RichardsDensityPrimeAux.h"
 
registerMooseObject("RichardsApp", RichardsDensityPrimeAux);
 
template <>
InputParameters
validParams<RichardsDensityPrimeAux>()
{
  InputParameters params = validParams<AuxKernel>();
  params.addRequiredCoupledVar("pressure_var", "The variable that represents the pressure");
  params.addRequiredParam<UserObjectName>("density_UO",
                                          "Name of user object that defines the density.");
  params.addClassDescription("auxillary variable which is d(density)/dp");
  return params;
}
 
RichardsDensityPrimeAux::RichardsDensityPrimeAux(const InputParameters & parameters)
  : AuxKernel(parameters),
    _pressure_var(coupledValue("pressure_var")),
    _density_UO(getUserObject<RichardsDensity>("density_UO"))
{
}
 
Real
RichardsDensityPrimeAux::computeValue()
{
  return _density_UO.ddensity(_pressure_var[_qp]);
}