12 files changed, 1660 insertions, 0 deletions
diff --git a/examples/laminar/cavity2d/parallel/Makefile b/examples/laminar/cavity2d/parallel/Makefile
new file mode 100644
index 0000000..a953954
--- /dev/null
+++ b/examples/laminar/cavity2d/parallel/Makefile
@@ -0,0 +1,105 @@
+#  This file is part of the OpenLB library
+#
+#  Copyright (C) 2007 Mathias 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.
+
+###########################################################################
+## definitions
+
+include definitions.mk
+
+include $(ROOT)/global.mk
+
+OBJECTS    := $(foreach file, $(SRC), $(PWD)/$(file:.cpp=.o))
+DEPS       := $(foreach file, $(SRC), $(PWD)/$(file:.cpp=.d))
+
+###########################################################################
+## all
+
+all : depend compile link
+
+
+###########################################################################
+## dependencies
+
+depend : $(DEPS)
+
+$(PWD)/%.d : %.cpp
+	@echo Create dependencies for $<
+	@$(SHELL) -ec '$(CXX) -M $(CXXFLAGS) $(IDIR) $< \
+                       | sed -e "s!$*\.o!$(PWD)\/$*\.o!1" > .tmpfile; \
+                       cp -f .tmpfile $@;'
+
+###########################################################################
+## compile
+
+compile : $(OBJECTS)
+
+$(PWD)/%.o: %.cpp
+	@echo Compile $<
+	$(CXX) $(CXXFLAGS) $(IDIR) -c $< -o $@
+
+###########################################################################
+## clean
+
+clean : cleanrub cleanobj cleandep
+
+cleanrub:
+	@echo Clean rubbish files
+	@rm -f *~ core .tmpfile tmp/*.* $(OUTPUT)
+	@rm -f tmp/vtkData/*.* tmp/vtkData/data/*.* tmp/imageData/*.* tmp/gnuplotData/*.* tmp/gnuplotData/data/*.*
+
+cleanobj:
+	@echo Clean object files
+	@rm -f $(OBJECTS)
+
+cleandep:
+	@echo Clean dependencies files
+	@rm -f $(DEPS)
+
+cleanbuild:
+	@cd $(ROOT); \
+	 $(MAKE) cleanlib;
+
+###########################################################################
+## update lib
+
+$(ROOT)/$(LIBDIR)/lib$(LIB).a :
+	@cd $(ROOT); \
+	$(MAKE) all
+
+###########################################################################
+## link
+
+link: $(OUTPUT)
+
+$(OUTPUT): $(OBJECTS) $(ROOT)/$(LIBDIR)/lib$(LIB).a
+	@echo Link $@
+	$(CXX) $(foreach file, $(SRC), $(file:.cpp=.o)) $(LDFLAGS) -L$(ROOT)/$(LIBDIR) -l$(LIB) -lz -o $@
+
+###########################################################################
+## include dependencies
+
+ifneq "$(strip $(wildcard *.d))" ""
+   include $(foreach file,$(DEPS),$(file))
+endif
+
+###########################################################################
+###########################################################################
diff --git a/examples/laminar/cavity2d/parallel/cavity2d.cpp b/examples/laminar/cavity2d/parallel/cavity2d.cpp
new file mode 100644
index 0000000..9fcc143
--- /dev/null
+++ b/examples/laminar/cavity2d/parallel/cavity2d.cpp
@@ -0,0 +1,324 @@
+/*  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 parallel
+ * use. A version for sequential use is also available.
+ */
+
+
+#include "olb2D.h"
+#ifndef OLB_PRECOMPILED // Unless precompiled version is used,
+#include "olb2D.hh"   // include full template code
+#endif
+#include <vector>
+#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 prepareGeometry( UnitConverter<T,DESCRIPTOR> const& converter,
+                      SuperGeometry2D<T>& superGeometry ) {
+  OstreamManager clout( std::cout,"prepareGeometry" );
+  clout << "Prepare Geometry ..." << std::endl;
+
+
+  superGeometry.rename( 0,2 );
+  superGeometry.rename( 2,1,1,1 );
+  superGeometry.clean();
+
+  T eps = converter.getConversionFactorLength();
+  Vector<T,2> extend( T( 1 ) + 2*eps, 2*eps );
+  Vector<T,2> origin( T() - eps, T( 1 ) - eps );
+  IndicatorCuboid2D<T> lid( extend, origin );
+  // Set material number for lid
+  superGeometry.rename( 2,3,1,lid );
+
+  // Removes all not needed boundary voxels outside the surface
+  superGeometry.clean();
+  // Removes all not needed boundary voxels inside the surface
+  superGeometry.innerClean();
+  superGeometry.checkForErrors();
+  superGeometry.getStatistics().print();
+  clout << "Prepare Geometry ... OK" << std::endl;
+}
+
+void prepareLattice( UnitConverter<T,DESCRIPTOR> const& converter,
+                     SuperLattice2D<T, DESCRIPTOR>& sLattice,
+                     Dynamics<T, DESCRIPTOR>& bulkDynamics,
+                     sOnLatticeBoundaryCondition2D<T,DESCRIPTOR>& sBoundaryCondition,
+                     SuperGeometry2D<T>& superGeometry ) {
+
+  OstreamManager clout( std::cout,"prepareLattice" );
+  clout << "Prepare Lattice ..." << std::endl;
+
+  const T omega = converter.getLatticeRelaxationFrequency();
+
+  // link lattice with dynamics for collision step
+
+  // Material=0 -->do nothing
+  sLattice.defineDynamics( superGeometry, 0, &instances::getNoDynamics<T, DESCRIPTOR>() );
+
+  // Material=1 -->bulk dynamics
+  sLattice.defineDynamics( superGeometry, 1, &bulkDynamics );
+
+  // Material=2,3 -->bulk dynamics, velocity boundary
+  sLattice.defineDynamics( superGeometry, 2, &bulkDynamics );
+  sLattice.defineDynamics( superGeometry, 3, &bulkDynamics );
+  sBoundaryCondition.addVelocityBoundary( superGeometry, 2, omega );
+  sBoundaryCondition.addVelocityBoundary( superGeometry, 3, omega );
+
+  clout << "Prepare Lattice ... OK" << std::endl;
+}
+
+void setBoundaryValues( UnitConverter<T,DESCRIPTOR> const& converter,
+                        SuperLattice2D<T, DESCRIPTOR>& sLattice,
+                        int iT, SuperGeometry2D<T>& superGeometry ) {
+
+  if ( iT==0 ) {
+    // set initial values: v = [0,0]
+    AnalyticalConst2D<T,T> rhoF( 1 );
+    std::vector<T> velocity( 2,T() );
+    AnalyticalConst2D<T,T> uF( velocity );
+
+    auto bulkIndicator = superGeometry.getMaterialIndicator({1, 2, 3});
+    sLattice.iniEquilibrium( bulkIndicator, rhoF, uF );
+    sLattice.defineRhoU( bulkIndicator, rhoF, uF );
+
+    // set non-zero velocity for upper boundary cells
+    velocity[0] = converter.getCharLatticeVelocity();
+    AnalyticalConst2D<T,T> u( velocity );
+    sLattice.defineU( superGeometry, 3, u );
+
+    // Make the lattice ready for simulation
+    sLattice.initialize();
+  }
+}
+
+void getResults( SuperLattice2D<T, DESCRIPTOR>& sLattice,
+                 UnitConverter<T,DESCRIPTOR> const& converter, int iT, Timer<T>* timer,
+                 const T logT, const T maxPhysT, const T imSave, const T vtkSave,
+                 std::string filenameGif, std::string filenameVtk,
+                 const int timerPrintMode,
+                 const int timerTimeSteps, SuperGeometry2D<T>& superGeometry, bool converged ) {
+
+  OstreamManager clout( std::cout,"getResults" );
+
+  SuperVTMwriter2D<T> vtmWriter( filenameVtk );
+
+
+  if ( iT==0 ) {
+    // Writes the geometry, cuboid no. and rank no. as vti file for visualization
+    SuperLatticeGeometry2D<T, DESCRIPTOR> geometry( sLattice, superGeometry );
+    SuperLatticeCuboid2D<T, DESCRIPTOR> cuboid( sLattice );
+    SuperLatticeRank2D<T, DESCRIPTOR> rank( sLattice );
+    vtmWriter.write( geometry );
+    vtmWriter.write( cuboid );
+    vtmWriter.write( rank );
+    vtmWriter.createMasterFile();
+  }
+
+  // Get statistics
+  if ( iT%converter.getLatticeTime( logT )==0 || converged ) {
+    sLattice.getStatistics().print( iT, converter.getPhysTime( iT ) );
+  }
+
+  if ( iT%timerTimeSteps==0 || converged ) {
+    timer->print( iT,timerPrintMode );
+  }
+
+  // Writes the VTK files
+  if ( ( iT%converter.getLatticeTime( vtkSave )==0 && iT>0 ) || converged ) {
+    SuperLatticePhysVelocity2D<T,DESCRIPTOR> velocity( sLattice, converter );
+    SuperLatticePhysPressure2D<T,DESCRIPTOR> pressure( sLattice, converter );
+    vtmWriter.addFunctor( velocity );
+    vtmWriter.addFunctor( pressure );
+    vtmWriter.write( iT );
+  }
+
+  // Writes the Gif files
+  if ( ( iT%converter.getLatticeTime( imSave )==0 && iT>0 ) || converged ) {
+    SuperLatticePhysVelocity2D<T,DESCRIPTOR> velocity( sLattice, converter );
+    SuperEuklidNorm2D<T,DESCRIPTOR> normVel( velocity );
+    BlockReduction2D2D<T> planeReduction( normVel, 600, BlockDataSyncMode::ReduceOnly );
+    // write output of velocity as JPEG
+    heatmap::write(planeReduction, iT);
+  }
+
+  // Output for x-velocity along y-position at the last time step
+  if ( iT == converter.getLatticeTime( maxPhysT ) || converged ) {
+    // Gives access to velocity information on lattice
+    SuperLatticePhysVelocity2D<T, DESCRIPTOR> velocityField( sLattice, converter );
+    // Interpolation functor with velocityField information
+    AnalyticalFfromSuperF2D<T> interpolation( velocityField, true, 1 );
+
+    Vector<int,17> y_coord( {128, 125, 124, 123, 122, 109, 94, 79, 64, 58, 36, 22, 13, 9, 8, 7, 0} );
+    // Ghia, Ghia and Shin, 1982: "High-Re Solutions for Incompressible Flow Using the Navier-Stokes Equations and a Multigrid Method";  Table 1
+    Vector<T,17> vel_ghia_RE1000( { 1.0,     0.65928, 0.57492, 0.51117, 0.46604,
+                                    0.33304, 0.18719, 0.05702,-0.06080,-0.10648,
+                                    -0.27805,-0.38289,-0.29730,-0.22220,-0.20196,
+                                    -0.18109, 0.0
+                                  } );
+    Vector<T,17> vel_ghia_RE100( {1.0,     0.84123, 0.78871, 0.73722, 0.68717,
+                                  0.23151, 0.00332,-0.13641,-0.20581,-0.21090,
+                                  -0.15662,-0.10150,-0.06434,-0.04775,-0.04192,
+                                  -0.03717, 0.0
+                                 } );
+    Vector<T,17> vel_simulation;
+
+    // Gnuplot interface to create plots
+    static Gnuplot<T> gplot( "centerVelocityX" );
+    // Define comparison values
+    Vector<T,17> comparison = vel_ghia_RE1000;
+
+    for ( int nY = 0; nY < 17; ++nY ) {
+      // 17 data points evenly distributed between 0 and 1 (height)
+      T position[2] = {0.5, y_coord[nY]/128.0};
+      T velocity[2] = {T(), T()};
+      // Interpolate velocityField at "position" and save it in "velocity"
+      interpolation( velocity, position );
+      // Save value of velocity (in x-direction) in "vel_simulation" for every position "nY"
+      vel_simulation[nY] = velocity[0];
+      // Set data for plot output
+      gplot.setData( position[1], {vel_simulation[nY],comparison[nY]}, {"simulated","Ghia"} );
+    }
+    // Create PNG file
+    gplot.writePNG();
+    // Console output with results
+    clout << "absoluteErrorL2(line)=" << ( vel_simulation - comparison ).norm() / 17. << "; relativeErrorL2(line)=" << ( vel_simulation - comparison ).norm() / comparison.norm() << std::endl;
+  }
+}
+
+
+
+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, outputdir;
+  config["Application"]["OlbDir"].read( olbdir );
+  config["Output"]["OutputDir"].read( outputdir );
+  singleton::directories().setOlbDir( olbdir );
+  singleton::directories().setOutputDir( outputdir );
+
+  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 );
+
+
+  T logT = config["Output"]["Log"]["SaveTime"].get<T>();
+  T imSave = config["Output"]["VisualizationImages"]["SaveTime"].get<T>();
+  T vtkSave = config["Output"]["VisualizationVTK"]["SaveTime"].get<T>();
+  T maxPhysT = config["Application"]["PhysParameters"]["PhysMaxTime"].get<T>();
+  int timerSkipType = config["Output"]["Timer"]["SkipType"].get<T>();
+  int timerPrintMode = config["Output"]["Timer"]["PrintMode"].get<int>();
+  int timerTimeSteps = 1;
+
+  if ( timerSkipType == 0 ) {
+    timerTimeSteps = converter->getLatticeTime( 1. /*config["Output"]["Timer"]["PhysTime"].get<T>()*/ );
+  } else {
+//    config["Output"]["Timer"]["TimeSteps"].read( timerTimeSteps );
+  }
+
+  std::string filenameGif = config["Output"]["VisualizationImages"]["Filename"].get<std::string>();
+  std::string filenameVtk = config["Output"]["VisualizationVTK"]["Filename"].get<std::string>();
+
+  // === 2rd Step: Prepare Geometry ===
+  Vector<T,2> extend( 1,1 );
+  Vector<T,2> origin( 0,0 );
+  IndicatorCuboid2D<T> cuboid( extend, origin );
+
+#ifdef PARALLEL_MODE_MPI
+  CuboidGeometry2D<T> cuboidGeometry( cuboid, converter->getConversionFactorLength(), singleton::mpi().getSize() );
+#else
+  CuboidGeometry2D<T> cuboidGeometry( cuboid, converter->getConversionFactorLength(), 7 );
+#endif
+
+  cuboidGeometry.print();
+
+  HeuristicLoadBalancer<T> loadBalancer( cuboidGeometry );
+  SuperGeometry2D<T> superGeometry( cuboidGeometry, loadBalancer, 2 );
+  prepareGeometry( *converter, superGeometry );
+
+  // === 3rd Step: Prepare Lattice ===
+
+  SuperLattice2D<T, DESCRIPTOR> sLattice( superGeometry );
+
+  ConstRhoBGKdynamics<T, DESCRIPTOR> bulkDynamics (
+    converter->getLatticeRelaxationFrequency(),
+    instances::getBulkMomenta<T,DESCRIPTOR>()
+  );
+
+  sOnLatticeBoundaryCondition2D<T,DESCRIPTOR> sBoundaryCondition( sLattice );
+  createInterpBoundaryCondition2D<T,DESCRIPTOR,ConstRhoBGKdynamics<T,DESCRIPTOR> > ( sBoundaryCondition );
+
+  prepareLattice( *converter, sLattice, bulkDynamics, sBoundaryCondition, superGeometry );
+
+  // === 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( sLattice, *converter, iT, timer, logT, maxPhysT, imSave, vtkSave, filenameGif, filenameVtk,
+                  timerPrintMode, timerTimeSteps, superGeometry, converge.hasConverged() );
+      break;
+    }
+    // === 5th Step: Definition of Initial and Boundary Conditions ===
+    setBoundaryValues( *converter, sLattice, iT, superGeometry );
+    // === 6th Step: Collide and Stream Execution ===
+    sLattice.collideAndStream();
+    // === 7th Step: Computation and Output of the Results ===
+    getResults( sLattice, *converter, iT, timer, logT, maxPhysT, imSave, vtkSave, filenameGif, filenameVtk,
+                timerPrintMode, timerTimeSteps, superGeometry, converge.hasConverged() );
+    converge.takeValue( sLattice.getStatistics().getAverageEnergy(), true );
+  }
+  timer->stop();
+  timer->printSummary();
+  delete converter;
+  delete timer;
+}
diff --git a/examples/laminar/cavity2d/parallel/cavity2d.xml b/examples/laminar/cavity2d/parallel/cavity2d.xml
new file mode 100644
index 0000000..b810246
--- /dev/null
+++ b/examples/laminar/cavity2d/parallel/cavity2d.xml
@@ -0,0 +1,44 @@
+<Param>
+  <Application>
+    <Name>cavity2d</Name>
+    <dim>2</dim>
+    <OlbDir>../../</OlbDir>
+    <Discretization>
+      <Resolution>128</Resolution>
+     <LatticeRelaxationTime>0.5384</LatticeRelaxationTime>
+    </Discretization>
+    <PhysParameters>
+      <PhysMaxTime>100</PhysMaxTime>
+      <CharPhysLength>1</CharPhysLength>
+      <CharPhysVelocity>1</CharPhysVelocity>
+      <PhysViscosity>0.001</PhysViscosity>
+      <PhysDensity>1</PhysDensity>
+    </PhysParameters>
+    <ConvergenceCheck>
+      <interval>1</interval>
+      <residuum>1e-3</residuum>
+    </ConvergenceCheck>
+  </Application>
+  <Output>
+    <OutputDir>./tmp/</OutputDir>
+    <MultiOutput>false</MultiOutput>
+    <Log>
+      <Filename>cavity2d.log</Filename>
+      <SaveTime>1</SaveTime>
+    </Log>
+    <VisualizationVTK>
+      <Filename>cavity2dvtk</Filename>
+      <SaveTime>1</SaveTime>
+    </VisualizationVTK>
+    <VisualizationImages>
+      <Filename>cavity2dimage</Filename>
+      <SaveTime>5</SaveTime>
+    </VisualizationImages>
+    <Timer>
+      <PrintMode>0</PrintMode>
+      <SkipType>0</SkipType>
+      <PhysTime>1</PhysTime>
+      <PrintSummary>true</PrintSummary>
+    </Timer>
+  </Output>
+</Param>
diff --git a/examples/laminar/cavity2d/parallel/definitions.mk b/examples/laminar/cavity2d/parallel/definitions.mk
new file mode 100644
index 0000000..84ffdca
--- /dev/null
+++ b/examples/laminar/cavity2d/parallel/definitions.mk
@@ -0,0 +1,30 @@
+#  This file is part of the OpenLB library
+#
+#  Copyright (C) 2007 Mathias 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.
+
+
+###########################################################################
+###########################################################################
+## DEFINITIONS TO BE CHANGED
+
+ROOT            := ../../../..
+SRC             := cavity2d.cpp
+OUTPUT          := cavity2d
diff --git a/examples/laminar/cavity2d/parallel/description_cavity2d.xml b/examples/laminar/cavity2d/parallel/description_cavity2d.xml
new file mode 100644
index 0000000..63874e1
--- /dev/null
+++ b/examples/laminar/cavity2d/parallel/description_cavity2d.xml
@@ -0,0 +1,345 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<description xmlns="http://numhpc.math.kit.edu">
+  <version>0.1</version>
+  <block>
+    <name>Application</name>
+    <displayname>Application: Cavity 2D</displayname>
+    <enabled>true</enabled>
+    <key>
+      <name>Name</name>
+      <enabled>true</enabled>
+      <type>text</type>
+      <default>cavity2d</default>
+      <info>Name of the application</info>
+    </key>
+    <key>
+      <name>dim</name>
+      <displayname>Dimension</displayname>
+      <enabled>true</enabled>
+      <type>spinbox</type>
+      <default>2</default>
+      <min>2</min>
+      <max>2</max>
+      <info>Dimension of the domain</info>
+    </key>
+    <key>
+      <name>OlbDir</name>
+      <enabled>true</enabled>
+      <type>file</type>
+      <default>../../</default>
+      <info>Path to OpenLB directory</info>
+    </key>
+    <block>
+      <name>DiscParam</name>
+      <displayname>Discretization Parameters</displayname>
+      <enabled>true</enabled>
+      <key>
+        <name>latticeL</name>
+        <displayname>Lattice Length [Si]</displayname>
+        <enabled>true</enabled>
+        <type>decimal</type>
+        <default>0.0078125</default>
+        <info>
+          Length of a lattice cell in meter (proportional to Knudsen number)
+          (*obligatory)
+        </info>
+      </key>
+      <key>
+        <name>latticeU</name>
+        <displayname>Lattice Velocity</displayname>
+        <enabled>true</enabled>
+        <type>decimal</type>
+        <default>0.1</default>
+        <info>
+          Dimensionless lattice velocity (proportional to Mach number)
+        </info>
+      </key>
+    </block>
+    <block>
+      <name>PhysParam</name>
+      <displayname>Physical Parameters</displayname>
+      <enabled>true</enabled>
+      <key>
+        <name>MaxTime</name>
+        <displayname>MaxTime [Si]</displayname>
+        <enabled>true</enabled>
+        <type>decimal</type>
+        <default>15</default>
+        <info>
+          Maximal simulation time in seconds
+        </info>
+      </key>
+      <key>
+        <name>charL</name>
+        <displayname>Characteristical Length [Si]</displayname>
+        <enabled>true</enabled>
+        <type>decimal</type>
+        <default>1</default>
+        <info>Characteristical length in meter</info>
+      </key>
+      <key>
+        <name>charU</name>
+        <displayname>Characteristical Velocity [Si]</displayname>
+        <enabled>true</enabled>
+        <type>decimal</type>
+        <default>1</default>
+        <info>Characteristical speed in m/s</info>
+      </key>
+      <key>
+        <name>viscosityType</name>
+        <displayname>Describe viscosity by</displayname>
+        <enabled>true</enabled>
+        <type>combobox</type>
+        <defaultlist>
+          <item>Kinematic viscosity</item>
+          <item>Reynolds-Number</item>
+        </defaultlist>
+        <default>Kinematic viscosity</default>
+        <dep>
+          <value>Kinematic viscosity</value>
+          <target>
+            <targetblock>Application</targetblock>
+            <targetblock>PhysParam</targetblock>
+            <targetkey>charNu</targetkey>
+            <action>
+              <enablekey>true</enablekey>
+            </action>
+          </target>
+          <target>
+            <targetblock>Application</targetblock>
+            <targetblock>PhysParam</targetblock>
+            <targetkey>Re</targetkey>
+            <action>
+              <enablekey>false</enablekey>
+            </action>
+          </target>
+        </dep>
+        <dep>
+          <value>Reynolds-Number</value>
+          <target>
+            <targetblock>Application</targetblock>
+            <targetblock>PhysParam</targetblock>
+            <targetkey>Re</targetkey>
+            <action>
+              <enablekey>true</enablekey>
+            </action>
+          </target>
+          <target>
+            <targetblock>Application</targetblock>
+            <targetblock>PhysParam</targetblock>
+            <targetkey>charNu</targetkey>
+            <action>
+              <enablekey>false</enablekey>
+            </action>
+          </target>
+        </dep>
+        <info>Choose, whether you want to specify either characteristical kinematic viscosity or Reynolds-Number.</info>
+      </key>
+      <key>
+        <name>charNu</name>
+        <displayname>Characteristical Viscosity [Si]</displayname>
+        <enabled>true</enabled>
+        <type>decimal</type>
+        <default>0.001</default>
+        <info>
+          Kinematic viscosity in m^2/s
+        </info>
+      </key>
+      <key>
+        <name>Re</name>
+        <displayname>Reynolds-Number</displayname>
+        <enabled>false</enabled>
+        <type>decimal</type>
+        <default>100</default>
+        <info>
+          Reynolds number
+        </info>
+      </key>
+      <key>
+        <name>charRho</name>
+        <displayname>Characteristical Density [Si]</displayname>
+        <enabled>true</enabled>
+        <type>decimal</type>
+        <default>1</default>
+        <info>
+          Density factor rho in kg/m^d. As average latticeRho is always around 1, specify the average physical density here.
+          At some point latticeRho can be multplied by this factor to get the local physical density.
+        </info>
+      </key>
+      <key>
+        <name>charPressure</name>
+        <displayname>Characteristical Pressure [Si]</displayname>
+        <enabled>true</enabled>
+        <type>decimal</type>
+        <default>0</default>
+        <info>
+          This additive pressure constant in Pa is added to the relative pressure result of the computation
+          to get the absolute value.
+        </info>
+      </key>
+    </block>
+  </block>
+  <block>
+    <name>Output</name>
+    <displayname>Output Settings</displayname>
+    <enabled>true</enabled>
+    <key>
+      <name>OutputDir</name>
+      <enabled>true</enabled>
+      <type>file</type>
+      <default>./tmp/</default>
+      <info>Directory for output data</info>
+    </key>
+    <key>
+      <name>MultiOutput</name>
+      <displayname>Multi-Output Mode</displayname>
+      <enabled>true</enabled>
+      <type>checkbox</type>
+      <default>false</default>
+      <info>Chooses whether output will be activated per program (false) or per mpi process (true)</info>
+    </key>
+    <block>
+      <name>Log</name>
+      <displayname>Logging</displayname>
+      <enabled>true</enabled>
+      <key>
+        <name>Filename</name>
+        <enabled>true</enabled>
+        <type>file</type>
+        <default>cavity2d.log</default>
+        <info>Converter information will be stored in this file.</info>
+      </key>
+      <key>
+        <name>SaveTime</name>
+        <enabled>true</enabled>
+        <type>decimal</type>
+        <default>0.1</default>
+        <info>Time intervall for console output</info>
+      </key>
+    </block>
+    <block>
+      <name>VisualizationVTK</name>
+      <enabled>true</enabled>
+      <key>
+        <name>Filename</name>
+        <enabled>true</enabled>
+        <type>file</type>
+        <default>cavity2dvtk</default>
+        <info>No info</info>
+      </key>
+      <key>
+        <name>SaveTime</name>
+        <enabled>true</enabled>
+        <type>decimal</type>
+        <default>1</default>
+        <info>No info</info>
+      </key>
+    </block>
+    <block>
+      <name>VisualizationImages</name>
+      <enabled>true</enabled>
+      <key>
+        <name>Filename</name>
+        <enabled>true</enabled>
+        <type>file</type>
+        <default>cavity2dimage</default>
+        <info>No info</info>
+      </key>
+      <key>
+        <name>SaveTime</name>
+        <enabled>true</enabled>
+        <type>decimal</type>
+        <default>1</default>
+        <info>No info</info>
+      </key>
+    </block>
+    <block>
+      <name>Timer</name>
+      <enabled>true</enabled>
+      <key>
+        <name>PrintMode</name>
+        <displayname>Mode of Output</displayname>
+        <enabled>true</enabled>
+        <type>combobox</type>
+        <defaultlist>
+          <item value="0">csv-style</item>
+          <item value="1">one-line</item>
+          <item value="2">two-line-layout</item>
+        </defaultlist>
+        <default>0</default>
+        <info>Displays timer informations about current calculation with different output modes.</info>
+      </key>
+      <key>
+        <name>SkipType</name>
+        <displayname>Skip output by</displayname>
+        <enabled>true</enabled>
+        <type>combobox</type>
+        <defaultlist>
+          <item value="0">Physical time</item>
+          <item value="1">Time steps</item>
+        </defaultlist>
+        <default>0</default>
+        <dep>
+          <value>0</value>
+          <target>
+            <targetblock>Output</targetblock>
+            <targetblock>Timer</targetblock>
+            <targetkey>PhysTime</targetkey>
+            <action>
+              <enablekey>true</enablekey>
+            </action>
+          </target>
+          <target>
+            <targetblock>Output</targetblock>
+            <targetblock>Timer</targetblock>
+            <targetkey>TimeSteps</targetkey>
+            <action>
+              <enablekey>false</enablekey>
+            </action>
+          </target>
+        </dep>
+        <dep>
+          <value>1</value>
+          <target>
+            <targetblock>Output</targetblock>
+            <targetblock>Timer</targetblock>
+            <targetkey>PhysTime</targetkey>
+            <action>
+              <enablekey>false</enablekey>
+            </action>
+          </target>
+          <target>
+            <targetblock>Output</targetblock>
+            <targetblock>Timer</targetblock>
+            <targetkey>TimeSteps</targetkey>
+            <action>
+              <enablekey>true</enablekey>
+            </action>
+          </target>
+        </dep>
+        <info>Choose, whether timer information should displayed either by physical or computational time steps.</info>
+      </key>
+      <key>
+        <name>PhysTime</name>
+        <enabled>true</enabled>
+        <type>decimal</type>
+        <default>.1</default>
+        <info>No info</info>
+      </key>
+      <key>
+        <name>TimeSteps</name>
+        <enabled>false</enabled>
+        <type>text</type>
+        <default>128</default>
+        <info>1 will print every step, 2 each second, etc.</info>
+      </key>
+      <key>
+        <name>PrintSummary</name>
+        <enabled>true</enabled>
+        <type>checkbox</type>
+        <default>true</default>
+        <info>Determines whether a summary after calculation should be displayed or not.</info>
+      </key>
+    </block>
+  </block>
+</description>
d