low_mach_navier_stokes_stab_helper.h

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//-----------------------------------------------------------------------bl-
//--------------------------------------------------------------------------
//
// GRINS - General Reacting Incompressible Navier-Stokes
//
// Copyright (C) 2014-2017 Paul T. Bauman, Roy H. Stogner
// Copyright (C) 2010-2013 The PECOS Development Team
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the Version 2.1 GNU Lesser General
// Public License as published by the Free Software Foundation.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc. 51 Franklin Street, Fifth Floor,
// Boston, MA  02110-1301  USA
//
//-----------------------------------------------------------------------el-

#ifndef LOW_MACH_NAVIER_STOKES_STAB_HELPER_H
#define LOW_MACH_NAVIER_STOKES_STAB_HELPER_H

// GRINS
#include "grins/inc_navier_stokes_stab_helper.h"

namespace GRINS
{
  class LowMachNavierStokesStabilizationHelper : public IncompressibleNavierStokesStabilizationHelper
  {
  public:

    LowMachNavierStokesStabilizationHelper
    ( const std::string& helper_name,
      const GetPot& input);

    ~LowMachNavierStokesStabilizationHelper();

    libMesh::Real compute_tau_energy( AssemblyContext& c,
                                      unsigned int qp,
                                      libMesh::RealGradient& g,
                                      libMesh::RealTensor& G,
                                      libMesh::Real rho,
                                      libMesh::Gradient U,
                                      libMesh::Real k,
                                      libMesh::Real cp,
                                      bool is_steady ) const;

  }; // class LowMachNavierStokesStabilizationHelper

  /* ------------- Inline Functions ---------------*/
  inline
  libMesh::Real LowMachNavierStokesStabilizationHelper::compute_tau_energy( AssemblyContext& c,
                                                                            unsigned int qp,
                                                                            libMesh::RealGradient& g,
                                                                            libMesh::RealTensor& G,
                                                                            libMesh::Real rho,
                                                                            libMesh::Gradient U,
                                                                            libMesh::Real k,
                                                                            libMesh::Real cp,
                                                                            bool is_steady ) const
  {
    /*
      libMesh::Real tau = (rho*U)*(G*(rho*U)) + this->_C*k*k*G.contract(G);

      if(!is_steady)
      tau += (2.0*rho/c.get_deltat_value())*(2.0*rho/c.get_deltat_value());

      return this->_tau_factor/std::sqrt(tau);
    */
    return this->compute_tau( c, qp, k*k, g, G, rho*cp, U, is_steady );
  }

}
#endif // LOW_MACH_NAVIER_STOKES_STAB_HELPER_H