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+/*
+ *  Copyright (C) 2015 Marie-Luise Maier, Mathias J. Krause, Sascha Janz
+ *  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.
+ */
+
+/** Alberto Di Renzo, Francesco Paolo Di Maio:
+ * "Comparison of contact-force models for the simulation of collisions in
+ * DEM-based granular ow codes",
+ * Chemical Engineering Science 59 (2004) 525 - 541
+ *
+ * validation paper for contact:
+ * H. Kruggel-Emden, E. Simsek, S. Rickelt, S. Wirtz, V. Scherer: Review and
+ * extension of normal force models for the Discrete Element Method, Powder
+ * Technology 171 (2007) 157-173
+ */
+
+#ifndef HERTZMINDLINDERESIEWICZ3D_H
+#define HERTZMINDLINDERESIEWICZ3D_H
+
+#include <cmath>
+#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 HertzMindlinDeresiewicz3D: public Force3D<T, PARTICLETYPE> {
+
+public:
+  HertzMindlinDeresiewicz3D(T G1, T G2, T v1, T v2, T scale1 = T(1.), T scale2 = T(1.),
+                            bool validationKruggelEmden = false);
+  ~HertzMindlinDeresiewicz3D() override {};
+  void applyForce(typename std::deque<PARTICLETYPE<T> >::iterator p, int pInt,
+                  ParticleSystem3D<T, PARTICLETYPE> &pSys) override;
+  void computeForce(typename std::deque<PARTICLETYPE<T> >::iterator p, int pInt,
+                    ParticleSystem3D<T, PARTICLETYPE>& pSys, T force[3]);
+private:
+  T _G1;  // Shear modulus (PA)
+  T _G2;  // Shear modulus (PA)
+  T _v1;  // poisson ratio
+  T _v2;  // poisson ratio
+  T _scale1; // scales normal value of force
+  T _scale2; // scales tangential value of force
+  T E1, E2; // E-Modul Particle
+  T eE; // equivalent combined E-Modul
+  T eG; // equivalent combined E-Modul
+  // constant eta_n from paper H. Kruggel-Endem, Powder Technology 171 (2007) 157-173,
+  // Table 3 / brass particle
+  bool _validationKruggelEmden; // use values of paper
+};
+
+}
+
+#endif