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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
* which a Cell object can be instantiated -- header file.
*/
#ifndef LB_GUOZHAO_DYNAMICS_H
#define LB_GUOZHAO_DYNAMICS_H
#include "dynamics/guoZhaoLatticeDescriptors.h"
#include "core/util.h"
#include "core/postProcessing.h"
#include "core/latticeStatistics.h"
#include "dynamics/dynamics.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 GuoZhaoBGKdynamics : public BasicDynamics<T,DESCRIPTOR> {
public:
/// Constructor
GuoZhaoBGKdynamics(T omega_, Momenta<T,DESCRIPTOR>& momenta_);
/// Compute fluid velocity on the cell.
void computeU (
Cell<T,DESCRIPTOR> const& cell,
T u[DESCRIPTOR::d] ) const override;
/// Compute fluid velocity and particle density on the cell.
void computeRhoU (
Cell<T,DESCRIPTOR> const& cell,
T& rho, T u[DESCRIPTOR::d]) const override;
/// Compute equilibrium distribution function
T computeEquilibrium(int iPop, T rho, const T u[DESCRIPTOR::d], T uSqr) const override;
/// Collision step
void collide(Cell<T,DESCRIPTOR>& cell,
LatticeStatistics<T>& statistics_) override;
/// Get local relaxation parameter of the dynamics
T getOmega() const override;
/// Set local relaxation parameter of the dynamics
void setOmega(T omega_) override;
/// Get local porosity as per from the dynamics class member variable.
T getEpsilon();
protected:
/// Copies epsilon from external to member variable to provide access to computeEquilibrium.
void updateEpsilon(Cell<T,DESCRIPTOR>& cell);
T _omega; ///< relaxation parameter
T _epsilon; ///< porosity. Must be re-declared as a member variable to allow
};
}
#endif
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