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/* Lattice Boltzmann sample, written in C++, using the OpenLB
* library
*
* Copyright (C) 2019 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.
*/
/* Drag force models for Lagrangian two-way coupling -- generic implementation.
*/
#ifndef LB_DRAG_MODELS_HH
#define LB_DRAG_MODELS_HH
namespace olb {
////////////////////// Class DragModelBase ////////////////////////
template<typename T, typename Lattice, template<typename V> class Particle>
DragModelBase<T,Lattice,Particle>::DragModelBase(UnitConverter<T, Lattice>& converter)
: _converter(converter)
{}
////////////////////// Class StokesSimplifiedDragModel ////////////////////////
template<typename T, typename Lattice, template<typename V> class Particle>
StokesSimplifiedDragModel<T,Lattice,Particle>::StokesSimplifiedDragModel(UnitConverter<T, Lattice>& converter)
: DragModelBase<T,Lattice,Particle>(converter)
{}
template<typename T, typename Lattice, template<typename V> class Particle>
T StokesSimplifiedDragModel<T,Lattice,Particle>::operator() (
Particle<T>* p, T latticeVelF[], T latticeVelP[], int globicFull[] )
{
return 1.83;
}
////////////////////// Class MorsiDragModel ////////////////////////
template<typename T, typename Lattice, template<typename V> class Particle>
MorsiDragModel<T,Lattice,Particle>::MorsiDragModel(UnitConverter<T, Lattice>& converter)
: DragModelBase<T,Lattice,Particle>(converter)
{
this->_reP = std::make_shared<NewtonianParticleReynoldsNumber<T,Lattice,Particle> > (this->_converter);
}
template<typename T, typename Lattice, template<typename V> class Particle>
T MorsiDragModel<T,Lattice,Particle>::operator() (
Particle<T>* p, T latticeVelF[], T latticeVelP[], int globicFull[] )
{
T physVelRelative = this->_converter.getPhysVelocity (
sqrt( pow(latticeVelF[0] - latticeVelP[0],2) +
pow(latticeVelF[1] - latticeVelP[1],2) +
pow(latticeVelF[2] - latticeVelP[2],2) ) );
T ReP = this->_reP->operator() (p, physVelRelative, globicFull);
T a[3] = {T(), T(), T()};
if (ReP < 0.1) {
a[0] = 0.0; a[1] = 24.0; a[2] = 0.0;
}
else if (ReP < 1.0) {
a[0] = 3.69; a[1] = 22.73; a[2] = 0.0903;
}
else if (ReP < 10.0) {
a[0] = 1.222; a[1] = 29.16667; a[2] =-3.8889;
}
else if (ReP < 100.0) {
a[0] = 0.6167; a[1] = 46.5; a[2] =-116.67;
}
else if (ReP < 1000.0) {
a[0] = 0.3644; a[1] = 498.33; a[2] =-2778;
}
else if (ReP < 5000.0) {
a[0] = 0.357; a[1] = 148.62; a[2] =-4.75e4;
}
else if (ReP < 10000.0) {
a[0] = 0.46; a[1] =-490.546; a[2] = 57.87e4;
}
else {
a[0] = 0.5191; a[1] =-1662.5; a[2] = 5.4167e6;
}
return ( a[0] + a[1]/ReP + a[2]/(ReP*ReP) ) * physVelRelative;
}
////////////////////// Class DewsburyDragModel ////////////////////////
template<typename T, typename Lattice, template<typename V> class Particle>
DewsburyDragModel<T,Lattice,Particle>::DewsburyDragModel(UnitConverter<T, Lattice>& converter)
: DragModelBase<T,Lattice,Particle>(converter)
{
this->_reP = std::make_shared<NewtonianParticleReynoldsNumber<T,Lattice,Particle> > (this->_converter);
}
template<typename T, typename Lattice, template<typename V> class Particle>
T DewsburyDragModel<T,Lattice,Particle>::operator() (
Particle<T>* p, T latticeVelF[], T latticeVelP[], int globicFull[] )
{
T physVelRelative = this->_converter.getPhysVelocity (
sqrt( pow(latticeVelF[0] - latticeVelP[0],2) +
pow(latticeVelF[1] - latticeVelP[1],2) +
pow(latticeVelF[2] - latticeVelP[2],2) ) );
T ReP = this->_reP->operator() (p, physVelRelative, globicFull);
T Cd = 0.95;
if (ReP <= 195.) {
Cd = 16./ReP * (1. + 0.173*pow(ReP, 0.657))
+ 0.413 / (1. + 16300*pow(ReP, -1.09));
}
return Cd * this->_converter.getLatticeVelocity(physVelRelative);
}
////////////////////// Class PowerLawDewsburyDragModel ////////////////////////
template<typename T, typename Lattice, template<typename V> class Particle>
PowerLawDewsburyDragModel<T,Lattice,Particle>::PowerLawDewsburyDragModel (
UnitConverter<T, Lattice>& converter, SuperLattice3D<T, Lattice>& sLattice )
: DewsburyDragModel<T,Lattice,Particle>(converter)
{
this->_reP = std::make_shared<PowerLawParticleReynoldsNumber<T,Lattice,Particle> > (this->_converter, sLattice);
}
}
#endif
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