Simplify poiseuille2d as a starting point

i.e. restrict to non-forced BGK dynamics and bounce back boundaries.
Remove further distractions that will have to be modified anyway such as error norms.

1 files changed, 243 insertions, 0 deletions

diff --git a/apps/adrian/poiseuille2d/poiseuille2d.cpp b/apps/adrian/poiseuille2d/poiseuille2d.cpp
new file mode 100644
index 0000000..2f582ab
--- /dev/null
+++ b/apps/adrian/poiseuille2d/poiseuille2d.cpp
@@ -0,0 +1,243 @@
+/*  Lattice Boltzmann sample, written in C++, using the OpenLB
+ *  library
+ *
+ *  Copyright (C) 2007, 2012 Jonas Latt, Mathias J. Krause
+ *  Vojtech Cvrcek, Peter Weisbrod
+ *  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"
+#include "olb2D.hh"
+
+#include <vector>
+#include <cmath>
+#include <iostream>
+#include <iomanip>
+#include <fstream>
+
+using namespace olb;
+using namespace olb::descriptors;
+using namespace olb::graphics;
+using namespace std;
+
+typedef double T;
+
+#define DESCRIPTOR D2Q9Descriptor
+
+const T lx  = 2.;             // length of the channel
+const T ly  = 1.;             // height of the channel
+int N = 50;                   // resolution of the model
+const T Re = 10.;             // Reynolds number
+const T maxPhysT = 20.;       // max. simulation time in s, SI unit
+const T physInterval = 0.25;  // interval for the convergence check in s
+const T residuum = 1e-5;      // residuum for the convergence check
+const T tuner = 0.99;         // for partialSlip only: 0->bounceBack, 1->freeSlip
+
+
+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 );
+
+  Vector<T,2> extend;
+  Vector<T,2> origin;
+  T physSpacing = converter.getPhysDeltaX();
+
+  // Set material number for inflow
+  extend[1] = ly;
+  extend[0] = physSpacing / 2;
+  origin[0] -= physSpacing / 4;
+  IndicatorCuboid2D<T> inflow( extend, origin );
+  superGeometry.rename( 2,3,1,inflow );
+
+  // Set material number for outflow
+  origin[0] = lx - physSpacing / 4;
+  IndicatorCuboid2D<T> outflow( extend, origin );
+  superGeometry.rename( 2,4,1,outflow );
+
+  // 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.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();
+
+  sLattice.defineDynamics( superGeometry, 0, &instances::getNoDynamics<T, DESCRIPTOR>() );
+  sLattice.defineDynamics( superGeometry, 1, &bulkDynamics );
+  sLattice.defineDynamics( superGeometry, 2, &instances::getBounceBack<T, DESCRIPTOR>() );
+  sLattice.defineDynamics( superGeometry, 3, &bulkDynamics );
+  sLattice.defineDynamics( superGeometry, 4, &bulkDynamics );
+
+  sBoundaryCondition.addVelocityBoundary( superGeometry, 3, omega );
+  sBoundaryCondition.addPressureBoundary( superGeometry, 4, omega );
+
+  T Lx = converter.getLatticeLength( lx );
+  T Ly = converter.getLatticeLength( ly );
+
+  T p0 =8.*converter.getLatticeViscosity()*converter.getCharLatticeVelocity()*Lx/( Ly*Ly );
+  AnalyticalLinear2D<T,T> rho( -p0/lx*DESCRIPTOR<T>::invCs2 , 0 , p0*DESCRIPTOR<T>::invCs2+1 );
+
+  T maxVelocity = converter.getCharLatticeVelocity();
+  T distance2Wall = converter.getConversionFactorLength();
+  Poiseuille2D<T> u( superGeometry, 3, maxVelocity, distance2Wall );
+
+  // Initialize all values of distribution functions to their local equilibrium
+  sLattice.defineRhoU( superGeometry, 1, rho, u );
+  sLattice.iniEquilibrium( superGeometry, 1, rho, u );
+  sLattice.defineRhoU( superGeometry, 2, rho, u );
+  sLattice.iniEquilibrium( superGeometry, 2, rho, u );
+  sLattice.defineRhoU( superGeometry, 3, rho, u );
+  sLattice.iniEquilibrium( superGeometry, 3, rho, u );
+  sLattice.defineRhoU( superGeometry, 4, rho, u );
+  sLattice.iniEquilibrium( superGeometry, 4, rho, u );
+
+  sLattice.initialize();
+
+  clout << "Prepare Lattice ... OK" << std::endl;
+}
+
+void getResults( SuperLattice2D<T,DESCRIPTOR>& sLattice, Dynamics<T, DESCRIPTOR>& bulkDynamics,
+                 UnitConverter<T,DESCRIPTOR> const& converter, int iT,
+                 SuperGeometry2D<T>& superGeometry, Timer<T>& timer, bool hasConverged ) {
+
+  OstreamManager clout( std::cout,"getResults" );
+
+  SuperVTMwriter2D<T> vtmWriter( "poiseuille2d" );
+  SuperLatticePhysVelocity2D<T, DESCRIPTOR> velocity( sLattice, converter );
+  SuperLatticePhysPressure2D<T, DESCRIPTOR> pressure( sLattice, converter );
+  vtmWriter.addFunctor( velocity );
+  vtmWriter.addFunctor( pressure );
+
+  const int vtmIter  = converter.getLatticeTime( maxPhysT/20. );
+  const int statIter = converter.getLatticeTime( maxPhysT/20. );
+
+  if ( iT==0 ) {
+    SuperLatticeGeometry2D<T, DESCRIPTOR> geometry( sLattice, superGeometry );
+    SuperLatticeCuboid2D<T, DESCRIPTOR> cuboid( sLattice );
+    SuperLatticeRank2D<T, DESCRIPTOR> rank( sLattice );
+    superGeometry.rename( 0,2 );
+    vtmWriter.write( geometry );
+    vtmWriter.write( cuboid );
+    vtmWriter.write( rank );
+
+    vtmWriter.createMasterFile();
+  }
+
+  if ( iT%vtmIter==0 || hasConverged ) {
+    vtmWriter.write( iT );
+
+    SuperEuklidNorm2D<T, DESCRIPTOR> normVel( velocity );
+    BlockReduction2D2D<T> planeReduction( normVel, 600, BlockDataSyncMode::ReduceOnly );
+    // write output as JPEG
+    heatmap::write(planeReduction, iT);
+  }
+
+  if ( iT%statIter==0 || hasConverged ) {
+    timer.update( iT );
+    timer.printStep();
+
+    sLattice.getStatistics().print( iT,converter.getPhysTime( iT ) );
+  }
+}
+
+int main( int argc, char* argv[] ) {
+  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)   0.8,   // latticeRelaxationTime: relaxation time, have to be greater than 0.5!
+    (T)   1,     // charPhysLength: reference length of simulation geometry
+    (T)   1,     // charPhysVelocity: maximal/highest expected velocity during simulation in __m / s__
+    (T)   1./Re, // physViscosity: physical kinematic viscosity in __m^2 / s__
+    (T)   1.0    // physDensity: physical density in __kg / m^3__
+  );
+  converter.print();
+  converter.write("poiseuille2d");
+
+  Vector<T,2> extend( lx, ly );
+  Vector<T,2> origin;
+  IndicatorCuboid2D<T> cuboid( extend, origin );
+
+#ifdef PARALLEL_MODE_MPI
+  const int noOfCuboids = singleton::mpi().getSize();
+#else
+  const int noOfCuboids = 1;
+#endif
+  CuboidGeometry2D<T> cuboidGeometry( cuboid, converter.getConversionFactorLength(), noOfCuboids );
+
+  HeuristicLoadBalancer<T> loadBalancer( cuboidGeometry );
+  SuperGeometry2D<T> superGeometry( cuboidGeometry, loadBalancer, 2 );
+
+  prepareGeometry( converter, superGeometry );
+
+  SuperLattice2D<T, DESCRIPTOR> sLattice( superGeometry );
+
+  Dynamics<T, DESCRIPTOR>* bulkDynamics;
+  bulkDynamics = new BGKdynamics<T, DESCRIPTOR>( converter.getLatticeRelaxationFrequency(), instances::getBulkMomenta<T, DESCRIPTOR>() );
+
+  sOnLatticeBoundaryCondition2D<T, DESCRIPTOR> sBoundaryCondition( sLattice );
+  createInterpBoundaryCondition2D<T, DESCRIPTOR> ( sBoundaryCondition );
+
+  prepareLattice( converter, sLattice, *bulkDynamics, sBoundaryCondition, superGeometry );
+
+  clout << "starting simulation..." << endl;
+  Timer<T> timer( converter.getLatticeTime( maxPhysT ), superGeometry.getStatistics().getNvoxel() );
+  util::ValueTracer<T> converge( converter.getLatticeTime( physInterval ), residuum );
+  timer.start();
+
+  for ( int iT = 0; iT < converter.getLatticeTime( maxPhysT ); ++iT ) {
+    if ( converge.hasConverged() ) {
+      clout << "Simulation converged." << endl;
+      getResults( sLattice, *bulkDynamics, converter, iT, superGeometry, timer, converge.hasConverged() );
+
+      break;
+    }
+
+    sLattice.collideAndStream();
+
+    getResults( sLattice, *bulkDynamics, converter, iT, superGeometry, timer, converge.hasConverged()  );
+    converge.takeValue( sLattice.getStatistics().getAverageEnergy(), true );
+  }
+
+  timer.stop();
+  timer.printSummary();
+}