Initialize at openlb-1-3

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diff --git a/src/particles/twoWayCouplings/dragModels3D.h b/src/particles/twoWayCouplings/dragModels3D.h
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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 -- header file.
+ */
+
+#ifndef LB_DRAG_MODELS_H
+#define LB_DRAG_MODELS_H
+
+#include "functors/lattice/reductionF3D.h"
+#include "twoWayHelperFunctionals.h"
+
+namespace olb {
+
+/** Abstact base class for DragModelBase.
+  * Its raison d'etre consists of not being templetized in Lattice.
+  */
+template<typename T, template<typename V> class Particle>
+class DragModel {
+public:
+  /// Returns the scalar drag coefficient to overload. globicFull = { globic, latticeRoundedP[0, ..., 2] }
+  virtual T operator() (Particle<T>* p, T latticeVelF[], T latticeVelP[], int globicFull[])=0;
+protected:
+  /// Functional to compute particle Reynolds number
+  std::shared_ptr<ParticleReynoldsNumber<T, Particle> > _reP;
+};
+
+/** Abstact class for all the drag models.
+  * The virtual method computeDragCoeff returns the drag coefficient.
+  * Input parameters in attice units.
+  */
+template<typename T, typename Lattice, template<typename V> class Particle>
+class DragModelBase : public DragModel<T,Particle> {
+public:
+  /// Constructor
+  DragModelBase(UnitConverter<T, Lattice>& converter);
+  /// Returns the scalar drag coefficient to overload.
+  //virtual T operator() (Particle<T>* p, T latticeVelF[], T latticeVelP[], int globic)=0;
+protected:
+  UnitConverter<T, Lattice>& _converter; // reference to a UnitConverter
+};
+
+/** Class to compute a drag coefficient Cd=1.83 for low-Re Stokes drag.
+  */
+template<typename T, typename Lattice, template<typename V> class Particle>
+class StokesSimplifiedDragModel : public DragModelBase<T,Lattice,Particle> {
+public:
+  /// Constructor
+  StokesSimplifiedDragModel(UnitConverter<T, Lattice>& converter);
+  /// Returns the scalar drag coefficient. globicFull = { globic, latticeRoundedP[0, ..., 2] }
+  virtual T operator() (Particle<T>* p, T latticeVelF[], T latticeVelP[], int globicFull[]) override;
+};
+
+/** Class to compute the standard drag coefficient
+  * as in Morsi and Alexander (1972).
+  */
+template<typename T, typename Lattice, template<typename V> class Particle>
+class MorsiDragModel : public DragModelBase<T,Lattice,Particle> {
+public:
+  /// Constructor
+  MorsiDragModel(UnitConverter<T, Lattice>& converter);
+  /// Returns the scalar drag coefficient. globicFull = { globic, latticeRoundedP[0, ..., 2] }
+  virtual T operator() (Particle<T>* p, T latticeVelF[], T latticeVelP[], int globicFull[]) override;
+};
+
+/** Class to compute the drag coefficient for gas bubbles in a liquid fluid phase
+  * as in Dewsbury et al. (1999).
+  */
+template<typename T, typename Lattice, template<typename V> class Particle>
+class DewsburyDragModel : public DragModelBase<T,Lattice,Particle> {
+public:
+  /// Constructor
+  DewsburyDragModel(UnitConverter<T, Lattice>& converter);
+  /// Returns the scalar drag coefficient. globicFull = { globic, latticeRoundedP[0, ..., 2] }
+  virtual T operator() (Particle<T>* p, T latticeVelF[], T latticeVelP[], int globicFull[]) override;
+};
+
+/** Class to compute the drag coefficient for gas bubbles in a liquid fluid phase
+  * as in Dewsbury et al. (1999), in a power-law fluid.
+  */
+template<typename T, typename Lattice, template<typename V> class Particle>
+class PowerLawDewsburyDragModel : public DewsburyDragModel<T,Lattice,Particle> {
+public:
+  /// Constructor
+  PowerLawDewsburyDragModel ( 
+        UnitConverter<T, Lattice>& converter, SuperLattice3D<T, Lattice>& sLattice );
+};
+
+
+}
+
+#endif