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/* This file is part of the OpenLB library
*
* Copyright (C) 2016 Asher Zarth, Thomas Henn, Mathias J. Krause, 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
* BGK Dynamics for porous -- generic implementation.
*/
#ifndef POROUS_FORCED_BGK_DYNAMICS_HH
#define POROUS_FORCED_BGK_DYNAMICS_HH
#include "porousForcedBGKDynamics.h"
#include "core/cell.h"
#include "dynamics.h"
#include "core/util.h"
#include "lbHelpers.h"
#include "math.h"
namespace olb {
////////////////////// Class PorousForcedBGKdynamics //////////////////////////
template<typename T, typename DESCRIPTOR>
PorousForcedBGKdynamics<T,DESCRIPTOR>::PorousForcedBGKdynamics (
T omega, Momenta<T,DESCRIPTOR>& momenta)
: BasicDynamics<T,DESCRIPTOR>(momenta),
_omega(omega)
{
OLB_PRECONDITION( DESCRIPTOR::template provides<descriptors::FORCE>() );
}
template<typename T, typename DESCRIPTOR>
void PorousForcedBGKdynamics<T,DESCRIPTOR>::computeU (Cell<T,DESCRIPTOR> const& cell, T u[DESCRIPTOR::d] ) const
{
T rho;
this->_momenta.computeRhoU(cell, rho, u);
for (int iVel=0; iVel<DESCRIPTOR::d; ++iVel) {
u[iVel] += cell.template getFieldPointer<descriptors::FORCE>()[iVel] / (T)2.;
}
}
template<typename T, typename DESCRIPTOR>
void PorousForcedBGKdynamics<T,DESCRIPTOR>::computeRhoU (Cell<T,DESCRIPTOR> const& cell, T& rho, T u[DESCRIPTOR::d] ) const
{
this->_momenta.computeRhoU(cell, rho, u);
for (int iVel=0; iVel<DESCRIPTOR::d; ++iVel) {
u[iVel] += cell.template getFieldPointer<descriptors::FORCE>()[iVel] / (T)2.;
}
}
template<typename T, typename DESCRIPTOR>
void PorousForcedBGKdynamics<T,DESCRIPTOR>::collide (
Cell<T,DESCRIPTOR>& cell,
LatticeStatistics<T>& statistics )
{
T rho, u[DESCRIPTOR::d];
this->_momenta.computeRhoU(cell, rho, u);
T* force = cell.template getFieldPointer<descriptors::FORCE>();
for (int iVel=0; iVel<DESCRIPTOR::d; ++iVel) {
u[iVel] += force[iVel] / (T)2.;
}
T* porosity = cell.template getFieldPointer<descriptors::POROSITY>();
for (int i=0; i<DESCRIPTOR::d; i++) {
u[i] *= porosity[0];
}
T uSqr = lbHelpers<T,DESCRIPTOR>::bgkCollision(cell, rho, u, _omega);
lbHelpers<T,DESCRIPTOR>::addExternalForce(cell, u, _omega, rho);
statistics.incrementStats(rho, uSqr);
}
template<typename T, typename DESCRIPTOR>
T PorousForcedBGKdynamics<T,DESCRIPTOR>::getOmega() const
{
return _omega;
}
template<typename T, typename DESCRIPTOR>
void PorousForcedBGKdynamics<T,DESCRIPTOR>::setOmega(T omega)
{
_omega = omega;
}
} // olb
#endif
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