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/* This file is part of the OpenLB library
*
* Copyright (C) 2012, 2015 Mathias J. Krause, Vojtech Cvrcek, Davide Dapelo
* 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
* BGK Dynamics with adjusted omega -- header file.
* Strain rate similar to "J.Boyd, J. Buick and S.Green: A second-order accurate lattice Boltzmann non-Newtonian flow model"
* Power Law similar to "Huidan Yu, Sharath S. Girimaji, Li-Shi Luo - DNS and LES of decaying isotropic turbulence with and without frame rotation using lattice Boltzmann method"
*
*/
#ifndef POWER_LAW_BGK_DYNAMICS_H
#define POWER_LAW_BGK_DYNAMICS_H
#include "dynamics/dynamics.h"
#include "core/cell.h"
namespace olb {
/// Implementation of Power-Law Dynamics
template<typename T, typename DESCRIPTOR>
class PowerLawDynamics {
public:
/// Constructor
PowerLawDynamics(T m=0.1, T n=.5, T nuMin=T(2.9686e-3), T nuMax=T(3.1667));
protected:
/// Computes the local power-Law relaxation parameter
T computeOmegaPL ( Cell<T,DESCRIPTOR>& cell, T omega0,
T rho, T pi[util::TensorVal<DESCRIPTOR >::n] );
/// Computes squared norm of non-equilibrium part of 2nd momentum
virtual T PiNeqNormSqr(Cell<T,DESCRIPTOR>& cell ) =0;
protected:
T _m;
T _n;
T _omegaMin;
T _omegaMax;
};
/// Implementation of the BGK collision step
template<typename T, typename DESCRIPTOR>
class PowerLawBGKdynamics : public BGKdynamics<T,DESCRIPTOR>, public PowerLawDynamics<T,DESCRIPTOR> {
public:
/// Constructor
/// m,n...parameter in the power law model
PowerLawBGKdynamics(T omega, Momenta<T,DESCRIPTOR>& momenta, T m=0.1, T n=.5, T nuMin=T(2.9686e-3), T nuMax=T(3.1667));
/// Collision step
void collide(Cell<T,DESCRIPTOR>& cell, LatticeStatistics<T>& statistics) override;
protected:
/// Computes squared norm of non-equilibrium part of 2nd momentum
virtual T PiNeqNormSqr(Cell<T,DESCRIPTOR>& cell ) override;
};
/// Implementation of the forced BGK collision step
template<typename T, typename DESCRIPTOR>
class PowerLawForcedBGKdynamics : public ForcedBGKdynamics<T,DESCRIPTOR>, public PowerLawDynamics<T,DESCRIPTOR> {
public:
/// Constructor
/// m,n...parameter in the power law model
PowerLawForcedBGKdynamics(T omega, Momenta<T,DESCRIPTOR>& momenta, T m=0.1, T n=.5, T nuMin=T(2.9686e-3), T nuMax=T(3.1667));
/// Collision step
virtual void collide(Cell<T,DESCRIPTOR>& cell, LatticeStatistics<T>& statistics) override;
protected:
/// Computes squared norm of non-equilibrium part of 2nd momentum
virtual T PiNeqNormSqr(Cell<T,DESCRIPTOR>& cell ) override;
};
}
#endif
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