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Diffstat (limited to 'examples/multiComponent/rayleighTaylor2d/rayleighTaylor2d.cpp')
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diff --git a/examples/multiComponent/rayleighTaylor2d/rayleighTaylor2d.cpp b/examples/multiComponent/rayleighTaylor2d/rayleighTaylor2d.cpp new file mode 100644 index 0000000..c2f1ffb --- /dev/null +++ b/examples/multiComponent/rayleighTaylor2d/rayleighTaylor2d.cpp @@ -0,0 +1,309 @@ +/* Lattice Boltzmann sample, written in C++, using the OpenLB + * library + * + * Copyright (C) 2008 Orestis Malaspinas, Andrea Parmigiani + * 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. + */ + +/* rayleighTaylor2d.cpp: + * Rayleigh-Taylor instability in 2D, generated by a heavy + * fluid penetrating a light one. The multi-component fluid model + * by X. Shan and H. Chen is used. This example shows the usage + * of multicomponent flow and periodic boundaries. + */ + + +#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 nx = 400; +const int ny = 200; +const int maxIter = 20000; + + +// 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 and boundary + superGeometry.rename( 0,1 ); + + Vector<T,2> origin1( -.5, -.5 ); + Vector<T,2> origin2( -.5,ny/2. ); + Vector<T,2> origin3( -.5, ny-1.5 ); + Vector<T,2> extend1( nx+2, 1. ); + Vector<T,2> extend2( nx+2., ny/2.+2. ); + + IndicatorCuboid2D<T> bottom( extend1, origin1 ); + IndicatorCuboid2D<T> upper( extend2, origin2 ); + IndicatorCuboid2D<T> top( extend1, origin3 ); + + superGeometry.rename( 1,2,upper ); + superGeometry.rename( 1,3,bottom ); + superGeometry.rename( 2,4,top ); + + // 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( SuperLattice2D<T, DESCRIPTOR>& sLatticeOne, + SuperLattice2D<T, DESCRIPTOR>& sLatticeTwo, + Dynamics<T, DESCRIPTOR>& bulkDynamics1, + Dynamics<T, DESCRIPTOR>& bulkDynamics2, + Dynamics<T, DESCRIPTOR>& bounceBackRho0, + Dynamics<T, DESCRIPTOR>& bounceBackRho1, + SuperGeometry2D<T>& superGeometry ) { + + OstreamManager clout( std::cout,"prepareLattice" ); + clout << "Prepare Lattice ..." << std::endl; + + // The setup is: periodicity along horizontal direction, bounce-back on top + // and bottom. The upper half is initially filled with fluid 1 + random noise, + // and the lower half with fluid 2. Only fluid 1 experiences a forces, + // directed downwards. + + // define lattice Dynamics + sLatticeOne.defineDynamics( superGeometry, 0, &instances::getNoDynamics<T, DESCRIPTOR>() ); + sLatticeTwo.defineDynamics( superGeometry, 0, &instances::getNoDynamics<T, DESCRIPTOR>() ); + + sLatticeOne.defineDynamics( superGeometry, 1, &bulkDynamics1 ); + sLatticeOne.defineDynamics( superGeometry, 2, &bulkDynamics1 ); + sLatticeOne.defineDynamics( superGeometry, 3, &bulkDynamics1 ); + sLatticeOne.defineDynamics( superGeometry, 4, &bulkDynamics1 ); + sLatticeTwo.defineDynamics( superGeometry, 1, &bulkDynamics2 ); + sLatticeTwo.defineDynamics( superGeometry, 2, &bulkDynamics2 ); + sLatticeTwo.defineDynamics( superGeometry, 3, &bulkDynamics2 ); + sLatticeTwo.defineDynamics( superGeometry, 4, &bulkDynamics2 ); + + sLatticeOne.defineDynamics( superGeometry, 3, &bounceBackRho0 ); + sLatticeTwo.defineDynamics( superGeometry, 3, &bounceBackRho1 ); + sLatticeOne.defineDynamics( superGeometry, 4, &bounceBackRho1 ); + sLatticeTwo.defineDynamics( superGeometry, 4, &bounceBackRho0 ); + + clout << "Prepare Lattice ... OK" << std::endl; +} + +void setBoundaryValues( SuperLattice2D<T, DESCRIPTOR>& sLatticeOne, + SuperLattice2D<T, DESCRIPTOR>& sLatticeTwo, + T force, int iT, SuperGeometry2D<T>& superGeometry ) { + + if ( iT==0 ) { + + AnalyticalConst2D<T,T> noise( 4.e-2 ); + std::vector<T> v( 2,T() ); + AnalyticalConst2D<T,T> zeroV( v ); + AnalyticalConst2D<T,T> zero( 0. ); + AnalyticalLinear2D<T,T> one( 0.,-force*invCs2<T,DESCRIPTOR>(),0.98+force*ny*invCs2<T,DESCRIPTOR>() ); + AnalyticalConst2D<T,T> onePlus( 0.98+force*ny/2.*invCs2<T,DESCRIPTOR>() ); + AnalyticalRandom2D<T,T> random; + AnalyticalIdentity2D<T,T> randomOne( random*noise+one ); + AnalyticalIdentity2D<T,T> randomPlus( random*noise+onePlus ); + std::vector<T> F( 2,T() ); + F[1] = -force; + AnalyticalConst2D<T,T> f( F ); + + // for each material set the defineRhou and the Equilibrium + + sLatticeOne.defineRhoU( superGeometry, 1, zero, zeroV ); + sLatticeOne.iniEquilibrium( superGeometry, 1, zero, zeroV ); + sLatticeOne.defineField<descriptors::EXTERNAL_FORCE>( superGeometry, 1, f ); + sLatticeTwo.defineRhoU( superGeometry, 1, randomPlus, zeroV ); + sLatticeTwo.iniEquilibrium( superGeometry, 1, randomPlus, zeroV ); + + sLatticeOne.defineRhoU( superGeometry, 2, randomOne, zeroV ); + sLatticeOne.iniEquilibrium( superGeometry, 2, randomOne, zeroV ); + sLatticeOne.defineField<descriptors::EXTERNAL_FORCE>( superGeometry, 2, f ); + sLatticeTwo.defineRhoU( superGeometry, 2, zero, zeroV ); + sLatticeTwo.iniEquilibrium( superGeometry, 2, zero, zeroV ); + + /*sLatticeOne.defineRhoU(superGeometry, 3, zero, zeroV); + sLatticeOne.iniEquilibrium(superGeometry, 3, zero, zeroV); + sLatticeOne.defineField<descriptors::EXTERNAL_FORCE>(superGeometry, 3, f); + sLatticeTwo.defineRhoU(superGeometry, 3, one, zeroV); + sLatticeTwo.iniEquilibrium(superGeometry, 3, one, zeroV); + + sLatticeOne.defineRhoU(superGeometry, 4, one, zeroV); + sLatticeOne.iniEquilibrium(superGeometry, 4, one, zeroV); + sLatticeOne.defineField<descriptors::EXTERNAL_FORCE>(superGeometry, 4, f); + sLatticeTwo.defineRhoU(superGeometry, 4, zero, zeroV); + sLatticeTwo.iniEquilibrium(superGeometry, 4, zero, zeroV);*/ + + // Make the lattice ready for simulation + sLatticeOne.initialize(); + sLatticeTwo.initialize(); + } +} + +void getResults( SuperLattice2D<T, DESCRIPTOR>& sLatticeTwo, + SuperLattice2D<T, DESCRIPTOR>& sLatticeOne, int iT, + SuperGeometry2D<T>& superGeometry, Timer<T>& timer ) { + + OstreamManager clout( std::cout,"getResults" ); + SuperVTMwriter2D<T> vtmWriter( "rayleighTaylor2dsLatticeOne" ); + + const int vtkIter = 100; + const int statIter = 10; + + if ( iT==0 ) { + // Writes the geometry, cuboid no. and rank no. as vti file for visualization + SuperLatticeGeometry2D<T, DESCRIPTOR> geometry( sLatticeOne, superGeometry ); + SuperLatticeCuboid2D<T, DESCRIPTOR> cuboid( sLatticeOne ); + SuperLatticeRank2D<T, DESCRIPTOR> rank( sLatticeOne ); + vtmWriter.write( geometry ); + vtmWriter.write( cuboid ); + vtmWriter.write( rank ); + vtmWriter.createMasterFile(); + } + + // Get statistics + if ( iT%statIter==0 && iT > 0 ) { + // Timer console output + timer.update( iT ); + timer.printStep(); + + clout << "averageRhoFluidOne=" << sLatticeOne.getStatistics().getAverageRho(); + clout << "; averageRhoFluidTwo=" << sLatticeTwo.getStatistics().getAverageRho() << std::endl; + } + + // Writes the VTK files + if ( iT%vtkIter==0 ) { + clout << "Writing VTK ..." << std::endl; + SuperLatticeVelocity2D<T, DESCRIPTOR> velocity( sLatticeOne ); + SuperLatticeDensity2D<T, DESCRIPTOR> density( sLatticeOne ); + vtmWriter.addFunctor( velocity ); + vtmWriter.addFunctor( density ); + vtmWriter.write( iT ); + + BlockReduction2D2D<T> planeReduction( density, 600, BlockDataSyncMode::ReduceOnly ); + // write output as JPEG + heatmap::write(planeReduction, iT); + + clout << "Writing VTK ... OK" << std::endl; + } +} + +int main( int argc, char *argv[] ) { + + // === 1st Step: Initialization === + + olbInit( &argc, &argv ); + singleton::directories().setOutputDir( "./tmp/" ); + OstreamManager clout( std::cout,"main" ); + + const T omega1 = 1.0; + const T omega2 = 1.0; + const T G = 3.; + T force = 30./( T )ny/( T )ny; + + // === 2nd Step: Prepare Geometry === + // Instantiation of a cuboidGeometry with weights + +#ifdef PARALLEL_MODE_MPI + CuboidGeometry2D<T> cGeometry( 0, 0, 1, nx, ny, singleton::mpi().getSize() ); +#else + CuboidGeometry2D<T> cGeometry( 0, 0, 1, nx, ny, 1 ); +#endif + + cGeometry.setPeriodicity( true, false ); + + HeuristicLoadBalancer<T> loadBalancer( cGeometry ); + + SuperGeometry2D<T> superGeometry( cGeometry, loadBalancer, 2 ); + + prepareGeometry( superGeometry ); + + // === 3rd Step: Prepare Lattice === + + SuperLattice2D<T, DESCRIPTOR> sLatticeOne( superGeometry ); + SuperLattice2D<T, DESCRIPTOR> sLatticeTwo( superGeometry ); + + ForcedBGKdynamics<T, DESCRIPTOR> bulkDynamics1 ( + omega1, instances::getExternalVelocityMomenta<T,DESCRIPTOR>() ); + ForcedBGKdynamics<T, DESCRIPTOR> bulkDynamics2 ( + omega2, instances::getExternalVelocityMomenta<T,DESCRIPTOR>() ); + + // A bounce-back node with fictitious density 1, + // which is experienced by the partner fluid + BounceBack<T, DESCRIPTOR> bounceBackRho1( 1. ); + // A bounce-back node with fictitious density 0, + // which is experienced by the partner fluid + BounceBack<T, DESCRIPTOR> bounceBackRho0( 0. ); + + std::vector<T> rho0; + rho0.push_back( 1 ); + rho0.push_back( 1 ); + PsiEqualsRho<T,T> interactionPotential; + ShanChenForcedGenerator2D<T,DESCRIPTOR> coupling( G,rho0,interactionPotential ); + + sLatticeOne.addLatticeCoupling( coupling, sLatticeTwo ); + + prepareLattice( sLatticeOne, sLatticeTwo, bulkDynamics1, bulkDynamics2, + bounceBackRho0, bounceBackRho1, superGeometry ); + + // === 4th Step: Main Loop with Timer === + 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 === + setBoundaryValues( sLatticeOne, sLatticeTwo, force, iT, superGeometry ); + + // === 6th Step: Collide and Stream Execution === + sLatticeOne.collideAndStream(); + sLatticeTwo.collideAndStream(); + + sLatticeOne.communicate(); + sLatticeTwo.communicate(); + + sLatticeOne.executeCoupling(); + //sLatticeTwo.executeCoupling(); + + // === 7th Step: Computation and Output of the Results === + getResults( sLatticeTwo, sLatticeOne, iT, superGeometry, timer ); + } + + timer.stop(); + timer.printSummary(); +} + |