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+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2008 Orestis Malaspinas, Andrea Parmigiani
+ *  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
+ * A collection of dynamics classes (e.g. BGK) with which a Cell object
+ * can be instantiated -- header file.
+ */
+#ifndef POROUS_ADVECTION_DIFFUSION_DYNAMICS_H
+#define POROUS_ADVECTION_DIFFUSION_DYNAMICS_H
+
+#include "dynamics/dynamics.h"
+#include "core/cell.h"
+
+namespace olb {
+
+
+// ===== the porous BGK advection diffusion dynamics =====//
+/// This approach contains a slight error in the diffusion term.
+template<typename T, typename DESCRIPTOR>
+class PorousAdvectionDiffusionBGKdynamics : public BasicDynamics<T, DESCRIPTOR> {
+public:
+  /// Constructor
+  PorousAdvectionDiffusionBGKdynamics( T omega, Momenta<T, DESCRIPTOR>& momenta, T tSolid );
+  PorousAdvectionDiffusionBGKdynamics( const UnitConverter<T,DESCRIPTOR>& converter, Momenta<T, DESCRIPTOR>& momenta, T tSolid );
+  /// Compute equilibrium distribution function
+  T computeEquilibrium( int iPop, T rho, const T u[DESCRIPTOR::d], T uSqr ) const override;
+  /// Collision step
+  void collide( Cell<T, DESCRIPTOR>& cell, LatticeStatistics<T>& statistics ) override;
+  /// Get local relaxation parameter of the dynamics
+  T getOmega() const override;
+  /// Set local relaxation parameter of the dynamics
+  void setOmega( T omega ) override;
+  /// Set local relaxation parameter of the dynamics
+  T computeRho( const Cell<T, DESCRIPTOR>& cell ) const override;
+private:
+  T scaleTemp(const T rho, const T porosity) const; // scales temperature relative to porosity
+  T _omega;  ///< relaxation parameter
+  T _tSolid; // temperature in lattice units of material with porosity 0;
+};
+
+} // namespace olb
+
+#endif