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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 );
}
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