WallFrictionModels.h

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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

#pragma once

#include "libmesh/libmesh_common.h"
#include "ADReal.h"

using namespace libMesh;

namespace WallFriction
{

Real DarcyFrictionFactor(const Real & f_F);
ADReal DarcyFrictionFactor(const ADReal & f_F);

Real FanningFrictionFactorChurchill(Real Re, Real roughness, Real D_h);
ADReal FanningFrictionFactorChurchill(ADReal Re, ADReal roughness, ADReal D_h);

template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
auto
FanningFrictionFactorCheng(
    const T1 & Re, const T2 & a, const T3 & b, const T4 & c, const T5 & n, const T6 & PoD)
{
  using std::pow, std::max;
  return (a + b * (PoD - 1) + c * pow(PoD - 1, 2)) / pow(max(Re, 10.0), n);
}
}