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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.
*/
/* Models for Lagrangian back-coupling methods -- header file.
*/
#ifndef LB_BACK_COUPLING_MODELS_H
#define LB_BACK_COUPLING_MODELS_H
#include "twoWayHelperFunctionals.h"
namespace olb {
/** Abstact base class for BaseBackCouplingModel.
* Its raison d'etre consists of not being templetized in Lattice.
*/
template<typename T, template<typename V> class Particle>
class BackCouplingModel {
public:
/// Class operator to apply the coupling, for overload.
virtual bool operator() (Particle<T>* p, int globic, int material, int subCycles=1)=0;
/// Resets external field
virtual void resetExternalField(int material)=0;
};
/** Abstact class for all the back-coupling models,
* viz., momentum coupling from particle to fluid.
* Input parameters in attice units.
*/
template<typename T, typename Lattice, template<typename V> class Particle>
class BaseBackCouplingModel : public BackCouplingModel<T,Particle> {
public:
/// Resets external field
virtual void resetExternalField(int material) override;
protected:
/// Constructor
BaseBackCouplingModel ( UnitConverter<T, Lattice>& converter,
SuperLattice3D<T, Lattice>& sLattice,
SuperGeometry3D<T>& sGeometry );
UnitConverter<T, Lattice>& _converter; // reference to a UnitConverter
SuperGeometry3D<T>& _sGeometry;
SuperLattice3D<T, Lattice>& _sLattice; // reference to a lattice
private:
// Pointers to functions to reset fluid force
std::shared_ptr<AnalyticalConst3D<T, T> > _zeroAnalytical;
std::shared_ptr<AnalyticalComposed3D<T, T> > _zeroField;
};
/** Back-coupling is performed on the cell containing the particle
* and its neighbours within a cube of one lattice spacing, as per in Maier et al. (2017).
* Input parameters in attice units.
*/
template<typename T, typename Lattice, template<typename V> class Particle>
class CubicDeltaBackCouplingModel : public BaseBackCouplingModel<T,Lattice,Particle> {
public:
/// Constructor
CubicDeltaBackCouplingModel ( UnitConverter<T, Lattice>& converter,
SuperLattice3D<T, Lattice>& sLattice,
SuperGeometry3D<T>& sGeometry );
/// Class operator to apply the coupling.
virtual bool operator() (Particle<T>* p, int globic, int material, int subCycles=1) override;
protected:
int _range = 1;
T _delta[4][4][4] = { T() };
std::shared_ptr<SuperLatticeSmoothDiracDelta3D<T, Lattice> > _cubicDeltaFunctional;
};
/** Back-coupling is performed only on the cell containing the particle.
* Input parameters in attice units.
*/
template<typename T, typename Lattice, template<typename V> class Particle>
class LocalBackCouplingModel : public BaseBackCouplingModel<T,Lattice,Particle> {
public:
/// Constructor
LocalBackCouplingModel ( UnitConverter<T, Lattice>& converter,
SuperLattice3D<T, Lattice>& sLattice,
SuperGeometry3D<T>& sGeometry );
/// Class operator to apply the coupling.
virtual bool operator() (Particle<T>* p, int globic, int material, int subCycles=1) override;
};
/** Class for a generic non-local back-coupling model,
* viz., momentum coupling from particle to fluid.
* It reproduces the characteristics (viz., smoothing) of an input forward coupling model.
* Input parameters in attice units.
*/
template<typename T, typename Lattice, template<typename V> class Particle>
class NonLocalBaseBackCouplingModel : public BaseBackCouplingModel<T,Lattice,Particle> {
public:
/// Constructor
NonLocalBaseBackCouplingModel ( UnitConverter<T, Lattice>& converter,
SuperLattice3D<T, Lattice>& sLattice,
SuperGeometry3D<T>& sGeometry,
SmoothingFunctional<T, Lattice>& smoothingFunctional );
/// Class operator to apply the coupling.
virtual bool operator() (Particle<T>* p, int globic, int material, int subCycles=1) override;
protected:
SmoothingFunctional<T, Lattice>& _smoothingFunctional; // Functional to treat non-local smoothing
};
}
#endif
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