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diff --git a/src/dynamics/chopardDynamics.h b/src/dynamics/chopardDynamics.h
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+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2008 Jonas Latt
+ *  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
+ * BGK Dynamics with adjustable speed of sound -- header file.
+ */
+#ifndef CHOPARD_DYNAMICS_H
+#define CHOPARD_DYNAMICS_H
+
+#include "dynamics/dynamics.h"
+#include "core/cell.h"
+
+namespace olb {
+
+/// Implementation of the BGK collision step
+template<typename T, typename DESCRIPTOR>
+class ChopardDynamics : public BasicDynamics<T,DESCRIPTOR> {
+public:
+  /// Constructor
+  ChopardDynamics(T vs2_, T omega_, Momenta<T,DESCRIPTOR>& momenta_);
+  ChopardDynamics(T omega_, Momenta<T,DESCRIPTOR>& momenta_);
+  /// 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 speed of sound
+  void setVs2(T vs2_);
+  /// Get local speed of sound
+  T    getVs2() const;
+public:
+  static T chopardBgkCollision (
+    Cell<T,DESCRIPTOR>& cell, T rho, const T u[DESCRIPTOR::d], T vs2, T omega);
+  static T chopardEquilibrium (
+    int iPop, T rho, const T u[DESCRIPTOR::d], T uSqr, T vs2 );
+private:
+  T vs2;    ///< speed of sound
+  T omega;  ///< relaxation parameter
+};
+
+}
+
+#endif