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/* This file is part of the OpenLB library
*
* Copyright (C) 2006, 2007 Jonas Latt
* 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
* This object is a MRT LB dynamics as described in D.Yu et al. in
* Progress in Aerospace Sciences 39 (2003) 329-367
*/
#ifndef MRT_DYNAMICS_H
#define MRT_DYNAMICS_H
#include "dynamics/dynamics.h"
namespace olb {
template<typename T, typename DESCRIPTOR> class Cell;
/// Implementation of the entropic collision step
template<typename T, typename DESCRIPTOR>
class MRTdynamics : public BasicDynamics<T,DESCRIPTOR> {
public:
/// Constructor
MRTdynamics(T omega_, Momenta<T,DESCRIPTOR>& momenta_);
/// Compute equilibrium distribution function
T computeEquilibrium(int iPop, T rho, const T u[DESCRIPTOR::d], T uSqr) const override;
/// Compute all equilibrium moments
void computeAllEquilibrium(T momentaEq[DESCRIPTOR::q], T rho,
const T u[DESCRIPTOR::d], const T uSqr);
/// 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 relaxation parameter of the dynamics
T getLambda() const;
/// Set local relaxation parameter of the dynamics
void setLambda(T lambda_);
protected:
T invM_S[DESCRIPTOR::q][DESCRIPTOR::q]; // relaxation times matrix.
T omega; // the shear viscosity relaxation time
T lambda;// the bulk viscosity relaxation time
};
/// Implementation of the entropic collision step
template<typename T, typename DESCRIPTOR>
class ForcedMRTdynamics : public MRTdynamics<T,DESCRIPTOR> {
public:
/// Constructor
ForcedMRTdynamics(T omega_, Momenta<T,DESCRIPTOR>& momenta_);
/// Clone the object on its dynamic type.
virtual void collide(Cell<T,DESCRIPTOR>& cell,
LatticeStatistics<T>& statistics_);
};
/// Implementation of the entropic collision step
template<typename T, typename DESCRIPTOR>
class MRTdynamics2 : public MRTdynamics<T,DESCRIPTOR> {
public:
/// Constructor
MRTdynamics2(T omega_, Momenta<T,DESCRIPTOR>& momenta_);
/// Clone the object on its dynamic type.
virtual void collide(Cell<T,DESCRIPTOR>& cell,
LatticeStatistics<T>& statistics_);
protected:
T invM_S_2[DESCRIPTOR::q][DESCRIPTOR::q]; // relaxation times matrix.
T omega;
};
}
#endif
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