PorousFlowFLACrelperm.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

#include "PorousFlowFLACrelperm.h"

namespace PorousFlowFLACrelperm
{
Real
dRelativePermeability(Real seff, Real m)
{
  if (seff <= 0.0 || seff >= 1.0)
    return 0.0;
  return (1.0 + m) * m * std::pow(seff, m - 1.0) - m * (m + 1.0) * std::pow(seff, m);
}

Real
d2RelativePermeability(Real seff, Real m)
{
  if (seff <= 0.0 || seff >= 1.0)
    return 0.0;
  return (1.0 + m) * m * (m - 1.0) * std::pow(seff, m - 2.0) -
         m * (m + 1.0) * m * std::pow(seff, m - 1.0);
}
}