mrtdynamics.h

open lattice boltzmann project www.openlb.org

/*  This file is part of the OpenLB library
 *
 *  Copyright (C) 2006, 2007 Jonas Latt
 *  Address: Rue General Dufour 24,  1211 Geneva 4, Switzerland 
 *  E-mail: [e-mail]
 *
 *  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 "core/dynamics.h"

namespace olb {

template<typename T, template<typename U> class Lattice> class Cell;


/// Implementation of the entropic collision step
template<typename T, template<typename U> class Lattice>
class MRTdynamics : public BasicDynamics<T,Lattice> {
public:
    /// Constructor
    MRTdynamics(T omega_, Momenta<T,Lattice>& momenta_);
    /// Clone the object on its dynamic type.
    virtual MRTdynamics<T,Lattice>* clone() const;
    /// Compute equilibrium distribution function
    virtual T computeEquilibrium(int iPop, T rho, const T u[Lattice<T>::d], T uSqr) const;
    /// Collision step
    virtual void collide(Cell<T,Lattice>& cell,
                         LatticeStatistics<T>& statistics_);
    /// Collide with fixed velocity
    virtual void staticCollide(Cell<T,Lattice>& cell,
                               const T u[Lattice<T>::d],
                               LatticeStatistics<T>& statistics_);
    /// Get local relaxation parameter of the dynamics
    virtual T getOmega() const;
    /// Set local relaxation parameter of the dynamics
    virtual void setOmega(T omega_);
    /// Get local relaxation parameter of the dynamics
    T getLambda() const;
    /// Set local relaxation parameter of the dynamics
    void setLambda(T lambda_);
private:
    T invM_S[Lattice<T>::q][Lattice<T>::q]; // relaxation times matrix.
    T omega; // the shear viscosity relaxatin time
    T lambda;// the bulk viscosity relaxatin time
};



}

#endif