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diff --git a/src/dynamics/interactionPotential.h b/src/dynamics/interactionPotential.h
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+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2015 Peter Weisbrod
+ *  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 INTERACTION_POTENTIAL_H
+#define INTERACTION_POTENTIAL_H
+
+
+/**
+ *  The functor dimensions are given by F: S^m -> T^n  (S=source, T=target)
+ *  and are implemented via GenericF(n,m).
+ *  Don't get confused by the flipped order of source and target.
+ */
+
+namespace olb {
+
+// established -- original for both single- and multicomponent flow
+
+template <typename T, typename S>
+class ShanChen93 : public AnalyticalF1D<T,S> {
+private:
+  T _rhoZero;
+public:
+  ShanChen93(T rhoZero=1.);
+  bool operator() (T psi[], const S rho[]);
+};
+
+// established -- only multicomponent flow
+
+template <typename T, typename S>
+class PsiEqualsRho : public AnalyticalF1D<T,S> {
+private:
+public:
+  PsiEqualsRho();
+  bool operator() (T psi[], const S rho[]) override;
+};
+
+// established -- only singlecomponent flow
+
+template <typename T, typename S>
+class ShanChen94 : public AnalyticalF1D<T,S> {
+private:
+  T _rhoZero;
+  T _psiZero;
+public:
+  ShanChen94(T rhoZero=200., T psiZero=4.);
+  bool operator() (T psi[], const S rho[]) override;
+};
+
+template <typename T, typename S>
+class PengRobinson : public AnalyticalF1D<T,S> {
+private:
+  T _G;
+  T _acentricFactor;
+  T _a;
+  T _b;
+  T _R;
+  T _alpha;
+  T _t;
+  T _tc;
+public:
+  PengRobinson(T G, T acentricFactor=0.334, T a=2./49., T b=2./21., T tr=.8);
+  bool operator() (T psi[], const S rho[]);
+  // second operator allows to incorporate temperature changes
+  bool operator() (T psi[], const S rho[], const S t[]);
+};
+
+template <typename T, typename S>
+class CarnahanStarling : public AnalyticalF1D<T,S> {
+private:
+  T _G;
+  T _a;
+  T _b;
+  T _R;
+  T _t;
+public:
+  CarnahanStarling(T G, T a=1., T b=4., T tr=.7);
+  bool operator() (T psi[], const S rho[]) override;
+  // second operator allows to incorporate temperature changes
+  bool operator() (T psi[], const S rho[], const S t[]);
+};
+
+// under development -- for singlecomponent flow
+
+// 0.5 -> psiZero=0.65
+// 1 -> psiZero=1.9
+// 1.5 -> psiZero=3.5
+// 2. -> psiZero=5,45
+template <typename T, typename S>
+class Krause : public AnalyticalF1D<T,S> {
+private:
+  T _rhoZero;
+  T _psiZero;
+public:
+  Krause(T rhoZero=1., T psiZero=1.9);
+  bool operator() (T psi[], const S rho[]);
+};
+
+template <typename T, typename S> // density of liquid phase always equals rhoZero for G=-1
+class WeisbrodKrause : public AnalyticalF1D<T,S> {
+private:
+  T _rhoZero;
+  T _sigmu;
+public:
+  WeisbrodKrause(T rhoZero=1., T sigmu=1.);
+  bool operator() (T psi[], const S rho[]);
+};
+
+template <typename T, typename S> // not very good
+class Normal : public AnalyticalF1D<T,S> {
+private:
+  T _sigma;
+  T _mu;
+public:
+  Normal(T sigma=1., T mu=1.);
+  bool operator() (T psi[], const S rho[]);
+};
+
+} // end namespace olb
+
+#endif