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diff --git a/apps/adrian/cylinder2d/optimized_grid_n20/cylinder2d.cpp b/apps/adrian/cylinder2d/optimized_grid_n20/cylinder2d.cpp
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+++ b/apps/adrian/cylinder2d/optimized_grid_n20/cylinder2d.cpp
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+/*
+ *  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
+
+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         = 20;                     // resolution of the cylinder
+
+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(
+  cylinderD,   // char. phys. length
+  1.0,         // char. phys. velocity
+  0.1/Re,      // phsy. kinematic viscosity
+  1.0);        // char. phys. density
+
+#include "../common/model.h"
+
+void setupRefinement(Grid2D<T,DESCRIPTOR>& coarseGrid,
+                     Vector<T,2> domainOrigin, Vector<T,2> domainExtend,
+                     Vector<T,2> cylinderCenter)
+{
+  const auto coarseDeltaX = coarseGrid.getConverter().getPhysDeltaX();
+
+  const Vector<T,2> fineExtend {11.2*cylinderD, domainExtend[1]-1.5*coarseDeltaX};
+  const Vector<T,2> fineOrigin {0.5*cylinderD, coarseDeltaX};
+
+  auto& fineGrid = coarseGrid.refine(fineOrigin, fineExtend);
+  SchaeferTurek::prepareGeometry(fineGrid, domainOrigin, domainExtend);
+
+  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);
+  SchaeferTurek::prepareGeometry(fineGrid2, domainOrigin, domainExtend);
+
+  const Vector<T,2> fineExtend3 {1.4*cylinderD, 1.4*cylinderD};
+  const Vector<T,2> fineOrigin3 {cylinderCenter[0]-fineExtend3[0]/2, cylinderCenter[1]-fineExtend3[1]/2};
+
+  auto& fineGrid3 = fineGrid2.refine(fineOrigin3, fineExtend3);
+  SchaeferTurek::prepareGeometry(fineGrid3, domainOrigin, domainExtend);
+}
+
+int main(int argc, char* argv[])
+{
+  olbInit(&argc, &argv);
+  singleton::directories().setOutputDir("./tmp/");
+  OstreamManager clout(std::cout,"main");
+
+  IndicatorCuboid2D<T> coarseCuboid(SchaeferTurek::modelExtend, SchaeferTurek::modelOrigin);
+
+  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);
+
+  SchaeferTurek::prepareGeometry(coarseGrid, domainOrigin, domainExtend);
+
+  setupRefinement(coarseGrid, domainOrigin, domainExtend, SchaeferTurek::cylinderCenter);
+
+  coarseGrid.forEachGrid(SchaeferTurek::prepareLattice);
+
+  clout << "Total number of active cells: " << coarseGrid.getActiveVoxelN() << endl;
+  clout << "Starting simulation..." << endl;
+
+  const int statIter = coarseGrid.getConverter().getLatticeTime(0.01);
+  Timer<T> timer(
+    coarseGrid.getConverter().getLatticeTime(maxPhysT),
+    coarseGrid.getSuperGeometry().getStatistics().getNvoxel());
+  timer.start();
+
+  Grid2D<T,DESCRIPTOR>& cylinderGrid = coarseGrid.locate(SchaeferTurek::cylinderCenter);
+
+  for (int iT = 0; iT <= coarseGrid.getConverter().getLatticeTime(maxPhysT); ++iT) {
+    SchaeferTurek::setBoundaryValues(coarseGrid, iT);
+
+    coarseGrid.collideAndStream();
+
+    if (iT == 0 || iT%statIter == 0) {
+      timer.update(iT);
+      timer.printStep();
+
+      coarseGrid.forEachGrid("cylinder2d", [&](Grid2D<T,DESCRIPTOR>& grid, const std::string& id) {
+        SchaeferTurek::getResults(grid, id, iT);
+      });
+
+      SchaeferTurek::takeMeasurements(cylinderGrid, iT);
+    }
+  }
+
+  timer.stop();
+  timer.printSummary();
+}