Add cylinder2d resolution redistribution example

i.e. cylinder2d_optimized_grid contains roughly as many grid cells as a
uniformly resolved N=12 lattice but models the cylinder in more detail
and is more stable.

5 files changed, 538 insertions, 1 deletions

diff --git a/apps/adrian/cylinder2d_optimized_grid/Makefile b/apps/adrian/cylinder2d_optimized_grid/Makefile
new file mode 100644
index 0000000..a953954
--- /dev/null
+++ b/apps/adrian/cylinder2d_optimized_grid/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/apps/adrian/cylinder2d_optimized_grid/cylinder2d.cpp b/apps/adrian/cylinder2d_optimized_grid/cylinder2d.cpp
new file mode 100644
index 0000000..74ad91b
--- /dev/null
+++ b/apps/adrian/cylinder2d_optimized_grid/cylinder2d.cpp
@@ -0,0 +1,373 @@
+/*
+ *  Lattice Boltzmann grid refinement sample, written in C++,
+ *  using the OpenLB library
+ *
+ *  Copyright (C) 2019 Adrian Kummerländer
+ *  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.
+ */
+
+#include "olb2D.h"
+#ifndef OLB_PRECOMPILED
+#include "olb2D.hh"
+#endif
+
+#include <vector>
+
+using namespace olb;
+
+typedef double T;
+
+#define DESCRIPTOR descriptors::D2Q9Descriptor
+
+/// Setup geometry relative to cylinder diameter as defined by [SchaeferTurek96]
+const T   cylinderD = 0.1;
+const int N         = 5;                      // resolution of the cylinder
+const T   deltaR    = cylinderD / N;          // coarse lattice spacing
+const T   lx        = 22*cylinderD + deltaR;  // length of the channel
+const T   ly        = 4.1*cylinderD + deltaR; // height of the channel
+const T   cylinderX = 2*cylinderD;
+const T   cylinderY = 2*cylinderD + deltaR/2;
+
+const T   Re        = 100.;                   // Reynolds number
+const T   tau       = 0.51;                   // relaxation time
+const T   maxPhysT  = 16.;                    // max. simulation time in s, SI unit
+
+const Characteristics<T> PhysCharacteristics(
+  0.1,         // char. phys. length
+  1.0,         // char. phys. velocity
+  0.1/Re,      // phsy. kinematic viscosity
+  1.0);        // char. phys. density
+
+void prepareGeometry(Grid2D<T,DESCRIPTOR>& grid, Vector<T,2> origin, Vector<T,2> extend)
+{
+  OstreamManager clout(std::cout,"prepareGeometry");
+  clout << "Prepare Geometry ..." << std::endl;
+
+  auto& converter = grid.getConverter();
+  auto& sGeometry = grid.getSuperGeometry();
+
+  sGeometry.rename(0,1);
+
+  const T physSpacing = converter.getPhysDeltaX();
+
+  // Set material number for channel walls
+  {
+    const Vector<T,2> wallExtend { extend[0]+physSpacing/2, physSpacing/2 };
+    const Vector<T,2> wallOrigin = origin - physSpacing/4;
+
+    IndicatorCuboid2D<T> lowerWall(wallExtend, wallOrigin);
+    sGeometry.rename(1,2,lowerWall);
+  }
+  {
+    const Vector<T,2> wallExtend { extend[0]+physSpacing/2, physSpacing/2 };
+    const Vector<T,2> wallOrigin { origin[0]-physSpacing/4, extend[1]-physSpacing/4 };
+
+    IndicatorCuboid2D<T> upperWall(wallExtend, wallOrigin);
+    sGeometry.rename(1,2,upperWall);
+  }
+
+  // Set material number for inflow and outflow
+  {
+    const Vector<T,2> inflowExtend { physSpacing/2, extend[1]+physSpacing/4 };
+    const Vector<T,2> inflowOrigin = origin - physSpacing/4;
+
+    IndicatorCuboid2D<T> inflow(inflowExtend, inflowOrigin);
+    sGeometry.rename(1,3,inflow);
+  }
+  {
+    const Vector<T,2> outflowExtend { physSpacing/2, extend[1]+physSpacing/4 };
+    const Vector<T,2> outflowOrigin { extend[0]-physSpacing/4, origin[0]-physSpacing/4 };
+
+    IndicatorCuboid2D<T> outflow(outflowExtend, outflowOrigin);
+    sGeometry.rename(1,4,outflow);
+  }
+
+  // Set material number for vertically centered cylinder
+  {
+    const Vector<T,2> cylinderOrigin = origin + Vector<T,2> {cylinderX, cylinderY};
+    IndicatorCircle2D<T> obstacle(cylinderOrigin, cylinderD/2);
+    sGeometry.rename(1,5,obstacle);
+  }
+
+  sGeometry.clean();
+  sGeometry.innerClean();
+  sGeometry.checkForErrors();
+
+  clout << "Prepare Geometry ... OK" << std::endl;
+}
+
+void disableRefinedArea(Grid2D<T,DESCRIPTOR>& coarseGrid,
+                        RefiningGrid2D<T,DESCRIPTOR>& fineGrid)
+{
+  auto& sGeometry = coarseGrid.getSuperGeometry();
+  auto refinedOverlap = fineGrid.getRefinedOverlap();
+  sGeometry.reset(*refinedOverlap);
+}
+
+void prepareLattice(Grid2D<T,DESCRIPTOR>& grid)
+{
+  OstreamManager clout(std::cout,"prepareLattice");
+  clout << "Prepare lattice ..." << std::endl;
+
+  auto& converter = grid.getConverter();
+  auto& sGeometry = grid.getSuperGeometry();
+  auto& sLattice  = grid.getSuperLattice();
+
+  Dynamics<T,DESCRIPTOR>& bulkDynamics = grid.addDynamics(
+      std::unique_ptr<Dynamics<T,DESCRIPTOR>>(
+        new BGKdynamics<T,DESCRIPTOR>(
+          grid.getConverter().getLatticeRelaxationFrequency(),
+          instances::getBulkMomenta<T,DESCRIPTOR>())));
+
+  sOnLatticeBoundaryCondition2D<T,DESCRIPTOR>& sBoundaryCondition = grid.getOnLatticeBoundaryCondition();
+  //createInterpBoundaryCondition2D<T,DESCRIPTOR>(sBoundaryCondition);
+  createLocalBoundaryCondition2D<T,DESCRIPTOR>(sBoundaryCondition);
+
+  const T omega = converter.getLatticeRelaxationFrequency();
+
+  sLattice.defineDynamics(sGeometry, 0, &instances::getNoDynamics<T,DESCRIPTOR>());
+  sLattice.defineDynamics(sGeometry, 1, &bulkDynamics); // bulk
+  sLattice.defineDynamics(sGeometry, 2, &bulkDynamics); // walls
+  sLattice.defineDynamics(sGeometry, 3, &bulkDynamics); // inflow
+  sLattice.defineDynamics(sGeometry, 4, &bulkDynamics); // outflow
+  sLattice.defineDynamics(sGeometry, 5, &instances::getBounceBack<T,DESCRIPTOR>()); // cylinder
+
+  sBoundaryCondition.addVelocityBoundary(sGeometry, 2, omega);
+  sBoundaryCondition.addVelocityBoundary(sGeometry, 3, omega);
+  sBoundaryCondition.addPressureBoundary(sGeometry, 4, omega);
+
+  AnalyticalConst2D<T,T> rho0(1.0);
+  AnalyticalConst2D<T,T> u0(0.0, 0.0);
+
+  auto materials = sGeometry.getMaterialIndicator({1, 2, 3, 4});
+  sLattice.defineRhoU(materials, rho0, u0);
+  sLattice.iniEquilibrium(materials, rho0, u0);
+
+  sLattice.initialize();
+
+  clout << "Prepare lattice ... OK" << std::endl;
+  sGeometry.print();
+}
+
+void setBoundaryValues(Grid2D<T,DESCRIPTOR>& grid, int iT)
+{
+  auto& converter = grid.getConverter();
+  auto& sGeometry = grid.getSuperGeometry();
+  auto& sLattice  = grid.getSuperLattice();
+
+  const int iTmaxStart = converter.getLatticeTime(0.4*16);
+  const int iTupdate = 5;
+
+  if ( iT % iTupdate == 0 && iT <= iTmaxStart ) {
+    PolynomialStartScale<T,T> StartScale(iTmaxStart, 1);
+
+    T iTvec[1] { T(iT) };
+    T frac[1] { };
+    StartScale(frac, iTvec);
+
+    const T maxVelocity = converter.getCharLatticeVelocity() * 3./2. * frac[0];
+    Poiseuille2D<T> u(sGeometry, 3, maxVelocity, deltaR/2);
+
+    sLattice.defineU(sGeometry, 3, u);
+  }
+}
+
+void getResults(const std::string& prefix,
+                Grid2D<T,DESCRIPTOR>& grid,
+                int iT)
+{
+  OstreamManager clout(std::cout,"getResults");
+
+  auto& converter = grid.getConverter();
+  auto& sLattice  = grid.getSuperLattice();
+  auto& sGeometry = grid.getSuperGeometry();
+
+  SuperVTMwriter2D<T> vtmWriter(prefix + "cylinder2d");
+  SuperLatticePhysVelocity2D<T,DESCRIPTOR> velocity(sLattice, converter);
+  SuperLatticePhysPressure2D<T,DESCRIPTOR> pressure(sLattice, converter);
+  SuperLatticeGeometry2D<T,DESCRIPTOR> geometry(sLattice, sGeometry);
+  SuperLatticeKnudsen2D<T,DESCRIPTOR> knudsen(sLattice);
+  vtmWriter.addFunctor(geometry);
+  vtmWriter.addFunctor(velocity);
+  vtmWriter.addFunctor(pressure);
+  vtmWriter.addFunctor(knudsen);
+
+  if (iT==0) {
+    vtmWriter.createMasterFile();
+  }
+
+  vtmWriter.write(iT);
+}
+
+void takeMeasurements(Grid2D<T,DESCRIPTOR>& grid)
+{
+  static T maxDrag = 0.0;
+
+  OstreamManager clout(std::cout,"measurement");
+
+  auto& sLattice  = grid.getSuperLattice();
+  auto& sGeometry = grid.getSuperGeometry();
+  auto& converter = grid.getConverter();
+
+  SuperLatticePhysPressure2D<T,DESCRIPTOR> pressure(sLattice, converter);
+  AnalyticalFfromSuperF2D<T> intpolatePressure(pressure, true);
+  SuperLatticePhysDrag2D<T,DESCRIPTOR> dragF(sLattice, sGeometry, 5, converter);
+
+  const T radiusCylinder  = cylinderD/2;
+
+  const T point1[2] { cylinderX - radiusCylinder, cylinderY };
+  const T point2[2] { cylinderX + radiusCylinder, cylinderY };
+
+  T pressureInFrontOfCylinder, pressureBehindCylinder;
+  intpolatePressure(&pressureInFrontOfCylinder, point1);
+  intpolatePressure(&pressureBehindCylinder,    point2);
+
+  T pressureDrop = pressureInFrontOfCylinder - pressureBehindCylinder;
+  clout << "pressureDrop=" << pressureDrop;
+
+  const int input[3] {};
+  T drag[dragF.getTargetDim()] {};
+  dragF(drag, input);
+  if (drag[0] > maxDrag) {
+    maxDrag = drag[0];
+  };
+  clout << "; drag=" << drag[0] << "; maxDrag: " << maxDrag << "; lift=" << drag[1] << endl;
+}
+
+int main(int argc, char* argv[])
+{
+  olbInit(&argc, &argv);
+  singleton::directories().setOutputDir("./tmp/");
+  OstreamManager clout(std::cout,"main");
+
+  const Vector<T,2> coarseOrigin {0.0, 0.0};
+  const Vector<T,2> coarseExtend {lx, ly};
+  IndicatorCuboid2D<T> coarseCuboid(coarseExtend, coarseOrigin);
+
+  Grid2D<T,DESCRIPTOR> coarseGrid(
+    coarseCuboid,
+    RelaxationTime<T>(tau),
+    N,
+    PhysCharacteristics);
+  const Vector<T,2> domainOrigin = coarseGrid.getSuperGeometry().getStatistics().getMinPhysR(0);
+  const Vector<T,2> domainExtend = coarseGrid.getSuperGeometry().getStatistics().getPhysExtend(0);
+
+  prepareGeometry(coarseGrid, domainOrigin, domainExtend);
+
+  const auto coarseDeltaX = coarseGrid.getConverter().getPhysDeltaX();
+
+  const Vector<T,2> fineOutflowExtend {1*cylinderD, domainExtend[1]};
+  const Vector<T,2> fineOutflowOrigin {domainExtend[0]-1*cylinderD, 0};
+
+  auto& fineOutflowGrid = coarseGrid.refine(fineOutflowOrigin, fineOutflowExtend, false);
+  prepareGeometry(fineOutflowGrid, domainOrigin, domainExtend);
+
+  {
+    const Vector<T,2> origin = fineOutflowGrid.getOrigin();
+    const Vector<T,2> extend = fineOutflowGrid.getExtend();
+
+    const Vector<T,2> extendY = {0,extend[1]};
+
+    coarseGrid.addFineCoupling(fineOutflowGrid, origin, extendY);
+    coarseGrid.addCoarseCoupling(fineOutflowGrid, origin + Vector<T,2> {coarseDeltaX,0}, extendY);
+
+    IndicatorCuboid2D<T> refined(extend, origin + Vector<T,2> {2*coarseDeltaX,0});
+    coarseGrid.getSuperGeometry().reset(refined);
+  }
+
+  const Vector<T,2> fineOutflowExtend2 {0.5*cylinderD, domainExtend[1]};
+  const Vector<T,2> fineOutflowOrigin2 {domainExtend[0]-0.5*cylinderD, 0};
+
+  auto& fineOutflowGrid2 = fineOutflowGrid.refine(fineOutflowOrigin2, fineOutflowExtend2, false);
+  prepareGeometry(fineOutflowGrid2, domainOrigin, domainExtend);
+
+  {
+    const Vector<T,2> origin = fineOutflowGrid2.getOrigin();
+    const Vector<T,2> extend = fineOutflowGrid2.getExtend();
+
+    const Vector<T,2> extendY = {0,extend[1]};
+
+    fineOutflowGrid.addFineCoupling(fineOutflowGrid2, origin, extendY);
+    fineOutflowGrid.addCoarseCoupling(fineOutflowGrid2, origin + Vector<T,2> {coarseDeltaX,0}, extendY);
+
+    IndicatorCuboid2D<T> refined(extend, origin + Vector<T,2> {coarseDeltaX,0});
+    fineOutflowGrid.getSuperGeometry().reset(refined);
+  }
+
+  const Vector<T,2> fineExtend {10.5*cylinderD, domainExtend[1]-2*coarseDeltaX};
+  const Vector<T,2> fineOrigin {0.5*cylinderD, coarseDeltaX};
+
+  auto& fineGrid = coarseGrid.refine(fineOrigin, fineExtend);
+  prepareGeometry(fineGrid, domainOrigin, domainExtend);
+  disableRefinedArea(coarseGrid, fineGrid);
+
+  const Vector<T,2> fineExtend2 {5*cylinderD, fineGrid.getExtend()[1]-2*coarseDeltaX};
+  const Vector<T,2> fineOrigin2 {1*cylinderD, (domainExtend[1]-fineExtend2[1])/2};
+
+  auto& fineGrid2 = fineGrid.refine(fineOrigin2, fineExtend2);
+  prepareGeometry(fineGrid2, domainOrigin, domainExtend);
+  disableRefinedArea(fineGrid, fineGrid2);
+
+  const Vector<T,2> fineExtend3 {1.25*cylinderD, 1.25*cylinderD};
+  const Vector<T,2> fineOrigin3 {cylinderX-fineExtend3[0]/2, cylinderY-fineExtend3[1]/2};
+
+  auto& fineGrid3 = fineGrid2.refine(fineOrigin3, fineExtend3);
+  prepareGeometry(fineGrid3, domainOrigin, domainExtend);
+  disableRefinedArea(fineGrid2, fineGrid3);
+
+  prepareLattice(coarseGrid);
+  prepareLattice(fineOutflowGrid);
+  prepareLattice(fineOutflowGrid2);
+  prepareLattice(fineGrid);
+  prepareLattice(fineGrid2);
+  prepareLattice(fineGrid3);
+
+  clout << "Total number of active cells: " << coarseGrid.getActiveVoxelN() << endl;
+  clout << "Starting simulation..." << endl;
+
+  const int statIter = coarseGrid.getConverter().getLatticeTime(0.5);
+  Timer<T> timer(
+    coarseGrid.getConverter().getLatticeTime(maxPhysT),
+    coarseGrid.getSuperGeometry().getStatistics().getNvoxel());
+  timer.start();
+
+  for (int iT = 0; iT <= coarseGrid.getConverter().getLatticeTime(maxPhysT); ++iT) {
+    setBoundaryValues(coarseGrid, iT);
+
+    coarseGrid.collideAndStream();
+
+    if (iT == 0 || iT%statIter == 0) {
+      timer.update(iT);
+      timer.printStep();
+
+      getResults("level0_", coarseGrid, iT);
+      getResults("level1_outflow_", fineOutflowGrid,   iT);
+      getResults("level2_outflow_", fineOutflowGrid2,   iT);
+      getResults("level1_", fineGrid, iT);
+      getResults("level2_", fineGrid2, iT);
+      getResults("level3_", fineGrid3, iT);
+
+      takeMeasurements(fineGrid3);
+    }
+  }
+
+  timer.stop();
+  timer.printSummary();
+}
diff --git a/apps/adrian/cylinder2d_optimized_grid/definitions.mk b/apps/adrian/cylinder2d_optimized_grid/definitions.mk
new file mode 100644
index 0000000..6584906
--- /dev/null
+++ b/apps/adrian/cylinder2d_optimized_grid/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             := cylinder2d.cpp
+OUTPUT          := cylinder2d
diff --git a/apps/adrian/cylinder2d_optimized_grid/module.mk b/apps/adrian/cylinder2d_optimized_grid/module.mk
new file mode 100644
index 0000000..1190482
--- /dev/null
+++ b/apps/adrian/cylinder2d_optimized_grid/module.mk
@@ -0,0 +1,29 @@
+#  This file is part of the OpenLB library
+#
+#  Copyright (C) 2017 Markus Mohrhard
+#  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.
+
+current_dir := $(dir $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST)))
+
+include global.mk
+include rules.mk
+include $(addsuffix definitions.mk, $(current_dir))
+
+$(eval $(call sample,$(current_dir)$(OUTPUT),$(addprefix $(current_dir), $(SRC))))
diff --git a/apps/adrian/cylinder2d_outflow_refinement/cylinder2d.cpp b/apps/adrian/cylinder2d_outflow_refinement/cylinder2d.cpp
index 598f828..8b6a49c 100644
--- a/apps/adrian/cylinder2d_outflow_refinement/cylinder2d.cpp
+++ b/apps/adrian/cylinder2d_outflow_refinement/cylinder2d.cpp
@@ -318,7 +318,7 @@ int main(int argc, char* argv[])
   clout << "Total number of active cells: " << coarseGrid.getActiveVoxelN() << endl;
   clout << "Starting simulation..." << endl;
 
-  const int statIter = coarseGrid.getConverter().getLatticeTime(0.05);
+  const int statIter = coarseGrid.getConverter().getLatticeTime(0.5);
   Timer<T> timer(
     coarseGrid.getConverter().getLatticeTime(maxPhysT),
     coarseGrid.getSuperGeometry().getStatistics().getNvoxel());