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/* This file is part of the OpenLB library
*
* Copyright (C) 2014 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.
*/
/* phaseSeparation2d.cpp:
* In this example the simulation is initialized with a given
* density plus a small random number all over the domain. This
* condition is unstable and leads to liquid-vapor phase separation.
* Boundaries are assumed to be periodic. This example shows the
* usage of multiphase flow.
*/
#include "olb2D.h"
#include "olb2D.hh" // use only generic version!
#include <cstdlib>
#include <iostream>
using namespace olb;
using namespace olb::descriptors;
using namespace olb::graphics;
using namespace std;
typedef double T;
#define DESCRIPTOR ShanChenDynOmegaForcedD2Q9Descriptor
// Parameters for the simulation setup
const int maxIter = 10000;
const int nx = 201;
const int ny = 201;
// Stores geometry information in form of material numbers
void prepareGeometry( SuperGeometry2D<T>& superGeometry ) {
OstreamManager clout( std::cout,"prepareGeometry" );
clout << "Prepare Geometry ..." << std::endl;
// Sets material number for fluid
superGeometry.rename( 0,1 );
// 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;
}
// Set up the geometry of the simulation
void prepareLattice( SuperLattice2D<T, DESCRIPTOR>& sLattice,
Dynamics<T, DESCRIPTOR>& bulkDynamics1,
SuperGeometry2D<T>& superGeometry ) {
// Material=1 -->bulk dynamics
sLattice.defineDynamics( superGeometry, 1, &bulkDynamics1 );
// Initial conditions
AnalyticalConst2D<T,T> noise( 2. );
std::vector<T> v( 2,T() );
AnalyticalConst2D<T,T> zeroVelocity( v );
AnalyticalConst2D<T,T> oldRho( 199. );
AnalyticalRandom2D<T,T> random;
AnalyticalIdentity2D<T,T> newRho( random*noise+oldRho );
// Initialize all values of distribution functions to their local equilibrium
sLattice.defineRhoU( superGeometry, 1, newRho, zeroVelocity );
sLattice.iniEquilibrium( superGeometry, 1, newRho, zeroVelocity );
// Make the lattice ready for simulation
sLattice.initialize();
}
// Output to console and files
void getResults( SuperLattice2D<T, DESCRIPTOR>& sLattice, int iT,
SuperGeometry2D<T>& superGeometry, Timer<T>& timer ) {
OstreamManager clout( std::cout,"getResults" );
SuperVTMwriter2D<T> vtmWriter( "phaseSeparation2d" );
SuperLatticeVelocity2D<T, DESCRIPTOR> velocity( sLattice );
SuperLatticeDensity2D<T, DESCRIPTOR> density( sLattice );
vtmWriter.addFunctor( velocity );
vtmWriter.addFunctor( density );
const int vtkIter = 20;
const int statIter = 20;
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();
}
// Writes the vtk files
if ( iT%vtkIter==0 ) {
clout << "Writing VTK and JPEG..." << std::endl;
vtmWriter.write( iT );
BlockReduction2D2D<T> planeReduction( density, 600, BlockDataSyncMode::ReduceOnly );
// write output as JPEG
heatmap::write(planeReduction, iT);
}
// Writes output on the console
if ( iT%statIter==0 ) {
// Timer console output
timer.update( iT );
timer.printStep();
// Lattice statistics console output
sLattice.getStatistics().print( iT,iT );
}
}
int main( int argc, char *argv[] ) {
// === 1st Step: Initialization ===
olbInit( &argc, &argv );
singleton::directories().setOutputDir( "./tmp/" );
OstreamManager clout( std::cout,"main" );
// display messages from every single mpi process
//clout.setMultiOutput(true);
const T omega1 = 1.0;
const T G = -120.;
// === 2rd Step: Prepare Geometry ===
// Instantiation of a cuboidGeometry with weights
#ifdef PARALLEL_MODE_MPI
const int noOfCuboids = singleton::mpi().getSize();
#else
const int noOfCuboids = 1;
#endif
CuboidGeometry2D<T> cuboidGeometry( 0, 0, 1, nx, ny, noOfCuboids );
// Periodic boundaries in x- and y-direction
cuboidGeometry.setPeriodicity( true, true );
// Instantiation of a loadBalancer
HeuristicLoadBalancer<T> loadBalancer( cuboidGeometry );
// Instantiation of a superGeometry
SuperGeometry2D<T> superGeometry( cuboidGeometry,loadBalancer,2 );
prepareGeometry( superGeometry );
// === 3rd Step: Prepare Lattice ===
SuperLattice2D<T, DESCRIPTOR> sLattice( superGeometry );
ForcedShanChenBGKdynamics<T, DESCRIPTOR> bulkDynamics1 (
omega1, instances::getExternalVelocityMomenta<T,DESCRIPTOR>() );
std::vector<T> rho0;
rho0.push_back( 1 );
rho0.push_back( 1 );
ShanChen94<T,T> interactionPotential;
ShanChenForcedSingleComponentGenerator2D<T,DESCRIPTOR> coupling( G,rho0,interactionPotential );
sLattice.addLatticeCoupling( coupling, sLattice );
prepareLattice( sLattice, bulkDynamics1, superGeometry );
// === 4th Step: Main Loop ===
int iT = 0;
clout << "starting simulation..." << endl;
Timer<T> timer( maxIter, superGeometry.getStatistics().getNvoxel() );
timer.start();
for ( iT = 0; iT < maxIter; ++iT ) {
// === 5th Step: Definition of Initial and Boundary Conditions ===
// in this application no boundary conditions have to be adjusted
// === 6th Step: Collide and Stream Execution ===
sLattice.collideAndStream();
sLattice.communicate();
sLattice.executeCoupling();
// === 7th Step: Computation and Output of the Results ===
getResults( sLattice, iT, superGeometry, timer );
}
timer.stop();
timer.printSummary();
}
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