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diff --git a/src/particles/forces/forceFromExtField3D.h b/src/particles/forces/forceFromExtField3D.h
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+++ b/src/particles/forces/forceFromExtField3D.h
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+/*
+ *  Copyright (C) 2018 Marie-Luise Maier
+ *  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.
+ */
+
+#ifndef ForceFromExtField3D_H
+#define ForceFromExtField3D_H
+
+#include "functors/lattice/superLatticeLocalF3D.h"
+#include "particles/particleSystem3D.h"
+#include "force3D.h"
+
+namespace olb {
+
+template<typename T, template<typename U> class PARTICLETYPE>
+class ParticleSystem3D;
+
+template<typename T, template<typename U> class PARTICLETYPE, typename DESCRIPTOR>
+class ForceFromExtField3D: public Force3D<T, PARTICLETYPE> {
+
+public:
+  // todo rename in ForceFromFunction3D or create new force
+  ForceFromExtField3D(
+//      SuperLattice3D<T, DESCRIPTOR>& sLattice,
+      //SuperLatticeField3D<T, DESCRIPTOR>& sLatticeForceField,
+      AnalyticalFfromSuperF3D<T>& analyticalExternalField,
+      T scale = T(1.) );
+  ~ForceFromExtField3D() override {};
+  void applyForce(typename std::deque<PARTICLETYPE<T> >::iterator p, int pInt,
+                  ParticleSystem3D<T, PARTICLETYPE>& psSys) override;
+private:
+//  SuperLattice3D<T, DESCRIPTOR>& _sLattice;
+//  SuperLatticeField3D<T, DESCRIPTOR>& _sLatticeForceField;
+  AnalyticalFfromSuperF3D<T>& _analyticalExternalField;
+  T _scale;
+};
+
+}
+
+#endif