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diff --git a/src/core/superExternal3D.hh b/src/core/superExternal3D.hh
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+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2015 Mathias J. Krause, Robin Trunk
+ *  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
+ * The description of a 3D super external field -- generic implementation.
+ */
+
+
+#ifndef SUPER_EXTERNAL_3D_HH
+#define SUPER_EXTERNAL_3D_HH
+
+
+#include "superExternal3D.h"
+#include "geometry/superGeometry3D.h"
+
+
+
+namespace olb {
+
+
+template<typename T, typename DESCRIPTOR, typename FIELD>
+SuperExternal3D<T,DESCRIPTOR,FIELD>::SuperExternal3D(SuperGeometry3D<T>& superGeometry,
+    SuperLattice3D<T,DESCRIPTOR>& sLattice, int overlap)
+  : SuperStructure3D<T>(superGeometry.getCuboidGeometry(), superGeometry.getLoadBalancer()),
+    _overlap(overlap), _sLattice(sLattice)
+{
+  this->_communicator.init_nh();
+  this->_communicator.add_cells(this->_overlap);
+  this->_communicator.init();
+}
+
+template<typename T, typename DESCRIPTOR, typename FIELD>
+void SuperExternal3D<T,DESCRIPTOR,FIELD>::communicate(bool verbose)
+{
+  this->_communicator.send();
+  this->_communicator.receive();
+  this->_communicator.write();
+}
+
+} // namespace olb
+
+#endif