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diff --git a/examples/laminar/cavity3d/sequential/cavity3d.cpp b/examples/laminar/cavity3d/sequential/cavity3d.cpp
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+/*  Lattice Boltzmann sample, written in C++, using the OpenLB
+ *  library
+ *
+ *  Copyright (C) 2014 Mathias J. Krause
+ *  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.
+ */
+
+/* cavity3d.cpp:
+ * This example illustrates a flow in a cuboid, lid-driven cavity.
+ * This version is for sequential use. A version for parallel use
+ * is also available.
+ */
+
+
+#include "olb3D.h"
+#ifndef OLB_PRECOMPILED // Unless precompiled version is used,
+#include "olb3D.hh"   // include full template code
+#endif
+
+#include <cmath>
+#include <iostream>
+#include <fstream>
+
+
+using namespace olb;
+using namespace olb::descriptors;
+using namespace olb::graphics;
+using namespace olb::util;
+using namespace std;
+
+typedef double T;
+#define DESCRIPTOR D3Q19<>
+
+const int N = 30; // resolution of the model
+//const int M = 1; // time discretization refinement
+const T maxT = (T) 100.; // max. simulation time in s, SI unit
+
+const T interval = 1.0; // Time intervall in seconds for convergence check
+const T epsilon = 1e-3; // Residuum for convergence check
+
+void prepareGeometry( UnitConverter<T, DESCRIPTOR> const& converter, IndicatorF3D<T>& indicator, BlockGeometry3D<T>& blockGeometry ) {
+
+  OstreamManager clout( std::cout,"prepareGeometry" );
+  clout << "Prepare Geometry ..." << std::endl;
+
+  // Sets material number for fluid and boundary
+  blockGeometry.rename( 0,2,indicator );
+  blockGeometry.rename( 2,1,1,1,1 );
+
+  Vector<T,3> origin( T(), converter.getCharPhysLength(), T() );
+  Vector<T,3> extend( converter.getCharPhysLength(), converter.getConversionFactorLength(), converter.getCharPhysLength() );
+  IndicatorCuboid3D<T> lid( extend,origin );
+
+  blockGeometry.rename( 2,3,1,lid );
+
+  // Removes all not needed boundary voxels outside the surface
+  blockGeometry.clean();
+  // Removes all not needed boundary voxels inside the surface
+  blockGeometry.innerClean();
+  blockGeometry.checkForErrors();
+
+  clout << "Prepare Geometry ... OK" << std::endl;
+}
+
+
+void prepareLattice( UnitConverter<T, DESCRIPTOR> const& converter,
+                     BlockLatticeStructure3D<T,DESCRIPTOR>& lattice,
+                     Dynamics<T, DESCRIPTOR>& bulkDynamics,
+                     OnLatticeBoundaryCondition3D<T,DESCRIPTOR>& bc,
+                     BlockGeometry3D<T>& blockGeometry) {
+
+  OstreamManager clout( std::cout,"prepareLattice" );
+  clout << "Prepare Lattice ..." << std::endl;
+
+  const T omega = converter.getLatticeRelaxationFrequency();
+
+  // Material=0 -->do nothing
+  lattice.defineDynamics( blockGeometry, 0, &instances::getNoDynamics<T, DESCRIPTOR>() );
+
+  // Material=1 -->bulk dynamics
+  lattice.defineDynamics( blockGeometry, 1, &bulkDynamics );
+
+  // Material=2 -->bounce back
+  //lattice.defineDynamics(superGeometry, 2, &instances::getBounceBack<T, DESCRIPTOR>());
+
+  // Material=2,3 -->bulk dynamics, velocity boundary
+  lattice.defineDynamics( blockGeometry, 2, &bulkDynamics );
+  lattice.defineDynamics( blockGeometry, 3, &bulkDynamics );
+  bc.addVelocityBoundary( blockGeometry, 2, omega );
+  bc.addVelocityBoundary( blockGeometry, 3, omega );
+
+  clout << "Prepare Lattice ... OK" << std::endl;
+}
+
+void setBoundaryValues( UnitConverter<T, DESCRIPTOR> const& converter,
+                        BlockLatticeStructure3D<T,DESCRIPTOR>& lattice, BlockGeometry3D<T>& blockGeometry, int iT ) {
+
+  OstreamManager clout( std::cout,"setBoundaryValues" );
+
+  if ( iT==0 ) {
+
+    AnalyticalConst3D<T,T> rhoF( 1 );
+    std::vector<T> velocity( 3,T() );
+    AnalyticalConst3D<T,T> uF( velocity );
+
+    lattice.iniEquilibrium( blockGeometry, 1, rhoF, uF );
+    lattice.iniEquilibrium( blockGeometry, 2, rhoF, uF );
+    lattice.iniEquilibrium( blockGeometry, 3, rhoF, uF );
+
+    lattice.defineRhoU( blockGeometry, 1, rhoF, uF );
+    lattice.defineRhoU( blockGeometry, 2, rhoF, uF );
+    lattice.defineRhoU( blockGeometry, 3, rhoF, uF );
+
+    velocity[0]=converter.getCharLatticeVelocity();
+    AnalyticalConst3D<T,T> u( velocity );
+
+    lattice.defineU( blockGeometry,3,u );
+
+    // Make the lattice ready for simulation
+    lattice.initialize();
+  }
+}
+
+void getResults( BlockLatticeStructure3D<T,DESCRIPTOR>& lattice,
+                 UnitConverter<T, DESCRIPTOR> const& converter, BlockGeometry3D<T>& blockGeometry, int iT, Timer<T>& timer, bool converged ) {
+
+  OstreamManager clout( std::cout,"getResults" );
+  BlockVTKwriter3D<T> vtkWriter( "cavity3d" );
+
+  const T logT     = ( T )1.;
+  const T vtkSave  = ( T )1.;
+
+  if ( iT==0 ) {
+    BlockLatticeGeometry3D<T, DESCRIPTOR> geometry( lattice, blockGeometry );
+    vtkWriter.write( geometry );
+  }
+
+  // Get statistics
+  if ( (iT%converter.getLatticeTime( logT )==0 && iT>0) || converged ) {
+    timer.update( iT );
+    timer.printStep( 2 );
+    lattice.getStatistics().print( iT,converter.getPhysTime( iT ) );
+  }
+
+  // Writes the VTK files
+  if ( (iT%converter.getLatticeTime( vtkSave )==0 && iT>0) || converged ) {
+
+    BlockLatticePhysVelocity3D<T, DESCRIPTOR> velocity( lattice, 0, converter );
+    BlockLatticePhysPressure3D<T, DESCRIPTOR> pressure( lattice, 0, converter );
+    vtkWriter.addFunctor( velocity );
+    vtkWriter.addFunctor( pressure );
+
+    vtkWriter.write( iT );
+  }
+}
+
+
+
+int main( int argc, char **argv ) {
+
+  // === 1st Step: Initialization ===
+
+  olbInit( &argc, &argv );
+  singleton::directories().setOutputDir( "./tmp/" );
+  OstreamManager clout( std::cout,"main" );
+
+  UnitConverterFromResolutionAndRelaxationTime<T, DESCRIPTOR> const converter(
+    int {N},     // resolution: number of voxels per charPhysL
+    (T)   0.509, // latticeRelaxationTime: relaxation time, have to be greater than 0.5!
+    (T)   1.0,   // charPhysLength: reference length of simulation geometry
+    (T)   1.0,   // charPhysVelocity: maximal/highest expected velocity during simulation in __m / s__
+    (T)   0.001, // physViscosity: physical kinematic viscosity in __m^2 / s__
+    (T)   1.0    // physDensity: physical density in __kg / m^3__
+  );
+  // Prints the converter log as console output
+  converter.print();
+  // Writes the converter log in a file
+  converter.write("cavity3d");
+
+
+  // === 2nd Step: Prepare Geometry ===
+
+  // Instantiation of a unit cube by an indicator
+  Vector<T,3> origin;
+  Vector<T,3> extend( converter.getCharPhysLength() );
+  IndicatorCuboid3D<T> cube( extend,origin );
+
+  Cuboid3D<T> cuboid( cube, converter.getConversionFactorLength() );
+
+  // Instantiation of a block geometry
+  BlockGeometry3D<T> blockGeometry( cuboid );
+
+  prepareGeometry( converter, cube, blockGeometry );
+
+
+  // === 3rd Step: Prepare Lattice ===
+
+  BlockLattice3D<T, DESCRIPTOR> lattice( blockGeometry.getNx(), blockGeometry.getNy(), blockGeometry.getNz(), blockGeometry );
+
+  ConstRhoBGKdynamics<T, DESCRIPTOR> bulkDynamics (
+    converter.getLatticeRelaxationFrequency(), instances::getBulkMomenta<T,DESCRIPTOR>() );
+
+  OnLatticeBoundaryCondition3D<T,DESCRIPTOR>*
+  boundaryCondition = createInterpBoundaryCondition3D<T,DESCRIPTOR,ConstRhoBGKdynamics<T,DESCRIPTOR> >( lattice );
+
+  prepareLattice( converter, lattice, bulkDynamics, *boundaryCondition, blockGeometry );
+
+  // === 4th Step: Main Loop with Timer ===
+  util::ValueTracer<T> converge( converter.getLatticeTime(interval), epsilon );
+
+  Timer<T> timer( converter.getLatticeTime( maxT ), std::pow<int>(converter.getResolution(),3) );
+  timer.start();
+  int iT;
+
+  for ( iT=0; iT < converter.getLatticeTime( maxT ); ++iT ) {
+
+    if ( converge.hasConverged() ) {
+      clout << "Simulation converged." << endl;
+      getResults( lattice, converter, blockGeometry, iT, timer, converge.hasConverged() );
+      break;
+    }
+
+    // === 5th Step: Definition of Initial and Boundary Conditions ===
+    setBoundaryValues( converter, lattice, blockGeometry, iT );
+
+    // === 6th Step: Collide and Stream Execution ===
+    lattice.collideAndStream();
+
+    // === 7th Step: Computation and Output of the Results ===
+    getResults( lattice, converter, blockGeometry, iT, timer, converge.hasConverged() );
+    converge.takeValue( lattice.getStatistics().getAverageEnergy(), true );
+  }
+
+  timer.stop();
+  timer.printSummary();
+}