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diff --git a/examples/laminar/cavity2d/sequential/cavity2d.cpp b/examples/laminar/cavity2d/sequential/cavity2d.cpp
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+/*  Lattice Boltzmann sample, written in C++, using the OpenLB
+ *  library
+ *
+ *  Copyright (C) 2006 - 2012 Mathias J. Krause, Jonas Fietz,
+ *  Jonas Latt, Jonas Kratzke
+ *  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.
+ */
+
+/* cavity2d.cpp:
+ * This example illustrates a flow in a cuboid, lid-driven cavity.
+ * It also shows how to use the XML parameter files and has an
+ * example description file for OpenGPI. This version is for sequential
+ * use. A version for parallel use is also available.
+ */
+
+
+#include "olb2D.h"
+#ifndef OLB_PRECOMPILED // Unless precompiled version is used,
+#include "olb2D.hh"   // include full template code
+#endif
+#include <cmath>
+#include <iostream>
+
+using namespace olb;
+using namespace olb::descriptors;
+using namespace olb::graphics;
+using namespace olb::util;
+using namespace std;
+
+typedef double T;
+#define DESCRIPTOR D2Q9<>
+
+void prepareLattice( UnitConverter<T,DESCRIPTOR> const& converter,
+                     BlockLatticeStructure2D<T,DESCRIPTOR>& lattice,
+                     Dynamics<T, DESCRIPTOR>& bulkDynamics,
+                     OnLatticeBoundaryCondition2D<T,DESCRIPTOR>& bc ) {
+
+  const int nx = lattice.getNx();
+  const int ny = lattice.getNy();
+  const T omega = converter.getLatticeRelaxationFrequency();
+
+  // link lattice with dynamics for collision step
+  lattice.defineDynamics( 0,nx-1, 0,ny-1, &bulkDynamics );
+
+  // left boundary
+  bc.addVelocityBoundary0N(   0,   0,   1,ny-2, omega );
+  // right boundary
+  bc.addVelocityBoundary0P( nx-1,nx-1,   1,ny-2, omega );
+  // bottom boundary
+  bc.addVelocityBoundary1N(   1,nx-2,   0,   0, omega );
+  // top boundary
+  bc.addVelocityBoundary1P(   1,nx-2,ny-1,ny-1, omega );
+
+  // corners
+  bc.addExternalVelocityCornerNN(   0,   0, omega );
+  bc.addExternalVelocityCornerNP(   0,ny-1, omega );
+  bc.addExternalVelocityCornerPN( nx-1,   0, omega );
+  bc.addExternalVelocityCornerPP( nx-1,ny-1, omega );
+}
+
+void setBoundaryValues( UnitConverter<T,DESCRIPTOR> const& converter,
+                        BlockLatticeStructure2D<T,DESCRIPTOR>& lattice, int iT ) {
+
+  if ( iT==0 ) {
+
+    const int nx = lattice.getNx();
+    const int ny = lattice.getNy();
+
+    // set initial values: v = [0,0]
+    for ( int iX=0; iX<nx; ++iX ) {
+      for ( int iY=0; iY<ny; ++iY ) {
+        T vel[] = { T(), T()};
+        lattice.get( iX,iY ).defineRhoU( ( T )1, vel );
+        lattice.get( iX,iY ).iniEquilibrium( ( T )1, vel );
+      }
+    }
+
+    // set non-zero velocity for upper boundary cells
+    for ( int iX=1; iX<nx-1; ++iX ) {
+      T u = converter.getCharLatticeVelocity();
+      T vel[] = { u, T() };
+      lattice.get( iX,ny-1 ).defineRhoU( ( T )1, vel );
+      lattice.get( iX,ny-1 ).iniEquilibrium( ( T )1, vel );
+    }
+
+    // Make the lattice ready for simulation
+    lattice.initialize();
+  }
+}
+
+void getResults( BlockLatticeStructure2D<T,DESCRIPTOR>& lattice,
+                 UnitConverter<T,DESCRIPTOR> const& converter, int iT, Timer<T>* timer,
+                 const T logT, const T imSave, const T vtkSave,
+                 std::string filenameGif, std::string filenameVtk,
+                 const int timerPrintMode, const int timerTimeSteps, bool converged ) {
+
+  // Get statistics
+  if ( iT%converter.getLatticeTime( logT )==0 || converged ) {
+    lattice.getStatistics().print( iT, converter.getPhysTime( iT ) );
+  }
+
+//  if ( iT%timerTimeSteps==0 || converged ) {
+  if ( iT%timerTimeSteps==0 ) {
+    timer->print( iT,timerPrintMode );
+  }
+
+  BlockVTKwriter2D<T> vtkWriter( filenameVtk );
+  BlockLatticePhysVelocity2D<T,DESCRIPTOR> velocity( lattice,converter );
+  BlockLatticePhysPressure2D<T,DESCRIPTOR> pressure( lattice,converter );
+  vtkWriter.addFunctor( velocity );
+  vtkWriter.addFunctor( pressure );
+
+  // Writes the Gif files
+  if ( ( iT%converter.getLatticeTime( imSave )==0 && iT>0 ) || converged ) {
+    BlockEuklidNorm2D<T,DESCRIPTOR> normVel( velocity );
+    BlockGifWriter<T> gifWriter;
+    gifWriter.write( normVel, 0, 3, iT, filenameVtk );
+//    gifWriter.write(normVel, iT, "vel");
+  }
+
+  // Writes the VTK files
+  if ( ( iT%converter.getLatticeTime( vtkSave )==0 && iT>0 ) || converged ) {
+    vtkWriter.write( iT );
+  }
+}
+
+
+int main( int argc, char* argv[] ) {
+
+  // === 1st Step: Initialization ===
+  olbInit( &argc, &argv );
+  OstreamManager clout( std::cout,"main" );
+
+  string fName( "cavity2d.xml" );
+  XMLreader config( fName );
+
+  std::string olbdir = "../../";  //config["Application"]["OlbDir"].get<std::string>();
+  std::string outputdir = "./tmp/"; //config["Output"]["OutputDir"].get<std::string>();
+  singleton::directories().setOlbDir( olbdir );
+  singleton::directories().setOutputDir( outputdir );
+
+  // call creator functions using xml data
+  UnitConverter<T,DESCRIPTOR>* converter = createUnitConverter<T,DESCRIPTOR>( config );
+  // Prints the converter log as console output
+  converter->print();
+  // Writes the converter log in a file
+  converter->write("cavity2d");
+
+  int N = converter->getLatticeLength(1) + 1; // number of voxels in x,y,z direction
+  Timer<T>* timer = createTimer<T>( config, *converter, N*N );
+
+  // === 3rd Step: Prepare Lattice ===
+  T logT = 0.1;   //config["Output"]["Log"]["SaveTime"].get<T>();
+  T imSave = 1;   //config["Output"]["VisualizationImages"]["SaveTime"].get<T>();
+  T vtkSave = 1;  //config["Output"]["VisualizationVTK"]["SaveTime"].get<T>();
+  T maxPhysT = 100; //config["Application"]["PhysParam"]["MaxTime"].get<T>();
+  int timerSkipType = 0;  //config["Output"]["Timer"]["SkipType"].get<T>();
+  int timerPrintMode = 0; //config["Output"]["Timer"]["PrintMode"].get<int>();
+  int timerTimeSteps = 1;
+
+  if ( timerSkipType == 0 ) {
+    timerTimeSteps = converter->getLatticeTime( .1 );
+  }
+//  else {
+//    config["Output"]["Timer"]["TimeSteps"].read( timerTimeSteps );
+//  }
+
+
+  std::string filenameGif = "cavity2dimage";  //config["Output"]["VisualizationImages"]["Filename"].get<std::string>();
+  std::string filenameVtk = "cavity2dvtk";    //config["Output"]["VisualizationVTK"]["Filename"].get<std::string>();
+
+  BlockLattice2D<T, DESCRIPTOR> lattice( N, N );
+
+  ConstRhoBGKdynamics<T, DESCRIPTOR> bulkDynamics (
+    converter->getLatticeRelaxationFrequency(),
+    instances::getBulkMomenta<T,DESCRIPTOR>()
+  );
+
+  OnLatticeBoundaryCondition2D<T,DESCRIPTOR>*
+  boundaryCondition = createInterpBoundaryCondition2D<T,DESCRIPTOR,ConstRhoBGKdynamics<T,DESCRIPTOR> >( lattice );
+
+  prepareLattice( *converter, lattice, bulkDynamics, *boundaryCondition );
+
+  // === 4th Step: Main Loop with Timer ===
+
+  int interval = converter->getLatticeTime( 1 /*config["Application"]["ConvergenceCheck"]["interval"].get<T>()*/ );
+  T epsilon = 1e-3; //config["Application"]["ConvergenceCheck"]["residuum"].get<T>();
+  util::ValueTracer<T> converge( interval, epsilon );
+
+  timer->start();
+  for ( int iT=0; iT <= converter->getLatticeTime( maxPhysT ); ++iT ) {
+    if ( converge.hasConverged() ) {
+      clout << "Simulation converged." << endl;
+      getResults( lattice, *converter, iT, timer, logT, imSave, vtkSave, filenameGif, filenameVtk, timerPrintMode, timerTimeSteps, converge.hasConverged() );
+
+      break;
+    }
+
+    // === 5th Step: Definition of Initial and Boundary Conditions ===
+    setBoundaryValues( *converter, lattice, iT );
+    // === 6th Step: Collide and Stream Execution ===
+    lattice.collideAndStream();
+    // === 7th Step: Computation and Output of the Results ===
+    getResults( lattice, *converter, iT, timer, logT, imSave, vtkSave, filenameGif, filenameVtk, timerPrintMode, timerTimeSteps, converge.hasConverged() );
+    converge.takeValue( lattice.getStatistics().getAverageEnergy(), true );
+  }
+
+  timer->stop();
+  timer->printSummary();
+  delete converter;
+  delete timer;
+  delete boundaryCondition;
+}