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diff --git a/src/dynamics/advectionDiffusionMomenta.h b/src/dynamics/advectionDiffusionMomenta.h
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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 ADVECTION_DIFFUSION_MOMENTA_H
+#define ADVECTION_DIFFUSION_MOMENTA_H
+
+#include "latticeDescriptors.h"
+#include "dynamics.h"
+
+namespace olb {
+
+/// Standard computation of velocity momenta in the bulk
+template<typename T, typename DESCRIPTOR>
+struct AdvectionDiffusionBulkMomenta : public Momenta<T,DESCRIPTOR> {
+  /// Compute particle density on the cell.
+  T computeRho(Cell<T,DESCRIPTOR> const& cell) const override;
+  /// Compute fluid velocity on the cell.
+  void computeU (
+    Cell<T,DESCRIPTOR> const& cell,
+    T u[DESCRIPTOR::d] ) const override;
+  /// Compute fluid momentum on the cell.
+  void computeJ (
+    Cell<T,DESCRIPTOR> const& cell,
+    T j[DESCRIPTOR::d] ) const override;
+  /// Compute components of the stress tensor on the cell.
+  void computeStress (
+    Cell<T,DESCRIPTOR> const& cell,
+    T rho, const T u[DESCRIPTOR::d],
+    T pi[util::TensorVal<DESCRIPTOR >::n] ) const override;
+  /// Compute fluid velocity and particle density on the cell.
+  void computeRhoU (
+    Cell<T,DESCRIPTOR> const& cell,
+    T& rho, T u[DESCRIPTOR::d]) const override;
+  /// Compute all momenta on the cell, up to second order.
+  void computeAllMomenta (
+    Cell<T,DESCRIPTOR> const& cell,
+    T& rho, T u[DESCRIPTOR::d],
+    T pi[util::TensorVal<DESCRIPTOR >::n] ) const override;
+  /// Set particle density on the cell.
+  void defineRho(Cell<T,DESCRIPTOR>& cell, T rho) override;
+  /// Set fluid velocity on the cell.
+  void defineU(Cell<T,DESCRIPTOR>& cell,
+                       const T u[DESCRIPTOR::d]) override;
+  /// Define fluid velocity and particle density on the cell.
+  void defineRhoU (
+    Cell<T,DESCRIPTOR>& cell,
+    T rho, const T u[DESCRIPTOR::d]) override;
+  /// Define all momenta on the cell, up to second order.
+  void defineAllMomenta (
+    Cell<T,DESCRIPTOR>& cell,
+    T rho, const T u[DESCRIPTOR::d],
+    const T pi[util::TensorVal<DESCRIPTOR >::n] ) override;
+};
+
+namespace instances {
+
+template<typename T, typename DESCRIPTOR>
+AdvectionDiffusionBulkMomenta<T,DESCRIPTOR>& getAdvectionDiffusionBulkMomenta();
+
+}
+
+}
+
+#endif