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/* This file is part of the OpenLB library
*
* Copyright (C) 2016-2017 Davide Dapelo, Mathias J. Krause
* OpenLB e-mail contact: info@openlb.net
* The most recent release of OpenLB can be downloaded at
* <http://www.openlb.net/>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/** \file
* Specific dynamics classes for Guo and Zhao (2002) porous model
* with a Smagorinsky LES turbulence model, with
* which a Cell object can be instantiated -- header file.
*/
#ifndef LB_SMAGO_GUOZHAO_DYNAMICS_H
#define LB_SMAGO_GUOZHAO_DYNAMICS_H
#include "dynamics/guoZhaoLatticeDescriptors.h"
#include "core/util.h"
#include "core/postProcessing.h"
#include "core/latticeStatistics.h"
namespace olb {
/// Implementation of the BGK collision step with porous force according to
/// Guo and Zhao (2012), described as an external force
template<typename T, typename DESCRIPTOR>
class SmagorinskyGuoZhaoBGKdynamics : public GuoZhaoBGKdynamics<T,DESCRIPTOR> {
public:
/// Constructor.
//Passing default value for smagoConst_ because 2D boundary conditions accept only
//two-argument constructor for dynamics class.
SmagorinskyGuoZhaoBGKdynamics(T omega_, Momenta<T,DESCRIPTOR>& momenta_, T smagoConst_ = 0.14,
T dx_ = 1, T dt_ = 1);
/// Collision step
virtual void collide(Cell<T,DESCRIPTOR>& cell,
LatticeStatistics<T>& statistics_);
/// Get local smagorinsky relaxation parameter of the dynamics
virtual T getSmagorinskyOmega(Cell<T,DESCRIPTOR>& cell_);
/// Set local relaxation parameter of the dynamics
virtual void setOmega(T omega_);
protected:
/// Computes a constant prefactor in order to speed up the computation
T computePreFactor(T omega_, T smagoConst_);
/// Computes the local smagorinsky relaxation parameter
T computeOmega(T omega0, T preFactor_, T rho,
T pi[util::TensorVal<DESCRIPTOR >::n] );
/// effective collision time based upon Smagorisnky approach
T tau_eff;
/// Smagorinsky constant
T smagoConst;
/// Precomputed constant which speeeds up the computation
T preFactor;
T dx;
T dt;
};
}
#endif
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