RichardsRelPermBW.h

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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

#pragma once

#include "RichardsRelPerm.h"

class RichardsRelPermBW : public RichardsRelPerm
{
public:
  static InputParameters validParams();

  RichardsRelPermBW(const InputParameters & parameters);

  Real relperm(Real seff) const;

  Real drelperm(Real seff) const;

  Real d2relperm(Real seff) const;

protected:
  // BW's initial saturation
  Real _sn;

  // BW's effective saturation where porepressure = 0
  Real _ss;

  // relative perm at Seff = Sn
  Real _kn;

  // relative perm at Seff = Ss
  Real _ks;

  // BW's C parameter
  Real _c;

  // (_ks - _kn)*(_c - 1)
  Real _coef;
};