void iniLattice( MultiBlockLattice3D<T,DESCRIPTOR>& lattice,
VoxelizedDomain3D<T>& voxelizedDomain )
{
// Switch all remaining outer cells to no-dynamics, except the outer
// boundary layer, and keep the rest as BGKdynamics.
defineDynamics(lattice, voxelizedDomain.getVoxelMatrix(), lattice.getBoundingBox(),
new NoDynamics<T,DESCRIPTOR>, voxelFlag::outside);
initializeAtEquilibrium(lattice, lattice.getBoundingBox(), (T) 1., Array<T,3>((T)0.,(T)0.,(T)0.));
lattice.initialize();
}
void cavitySetup( MultiBlockLattice3D<T,DESCRIPTOR>& lattice,
IncomprFlowParam<T> const& parameters,
OnLatticeBoundaryCondition3D<T,DESCRIPTOR>& boundaryCondition )
{
const plint nx = parameters.getNx();
const plint ny = parameters.getNy();
const plint nz = parameters.getNz();
Box3D topLid = Box3D(0, nx-1, ny-1, ny-1, 0, nz-1);
Box3D bottomLid = Box3D(0, nx-1, 0, 0, 0, nz-1);
Box3D everythingButTopLid = Box3D(0, nx-1, 0, ny-2, 0, nz-1);
/*
instantiateOuterNLDboundary(lattice, lattice.getBoundingBox());
setOuterNLDboundaryDynamics(lattice, lattice.getBackgroundDynamics().clone(),
lattice.getBoundingBox(), boundary::dirichlet);
setOuterNLDboundaryDynamics(lattice, lattice.getBackgroundDynamics().clone(), bottomLid, boundary::neumann);
defineDynamics(lattice, bottomLid, lattice.getBackgroundDynamics().clone());
*/
boundaryCondition.setVelocityConditionOnBlockBoundaries(lattice, lattice.getBoundingBox(), boundary::dirichlet);
T u = sqrt((T)2)/(T)2 * parameters.getLatticeU();
initializeAtEquilibrium(lattice, everythingButTopLid, (T) 1., Array<T,3>(0.,0.,0.) );
initializeAtEquilibrium(lattice, topLid, (T) 1., Array<T,3>(u,0.,u) );
setBoundaryVelocity(lattice, topLid, Array<T,3>(u,0.,u) );
lattice.initialize();
}
void writeVTK(MultiBlockLattice3D<T,DESCRIPTOR>& lattice,
IncomprFlowParam<T> const& parameters,
PhysUnits3D<T> const& units, plint iter)
{
T p_fact = units.getPhysForce(1)/pow(units.getPhysLength(1),2)/3.;
std::string fname(createFileName("vtk", iter, 6));
VtkImageOutput3D<T> vtkOut(fname, units.getPhysLength(1));
vtkOut.writeData<3,float>(*computeVelocity(lattice), "velocity", units.getPhysVel(1));
vtkOut.writeData<float>(*computeDensity(lattice), "density",units.getPhysDensity(1));
MultiScalarField3D<T> p(*computeDensity(lattice));
subtractInPlace(p,1.);
vtkOut.writeData<float>(p,"pressure",p_fact );
IBscalarQuantity sf = SolidFraction;
applyProcessingFunctional(new GetScalarQuantityFromDynamicsFunctional<T,DESCRIPTOR,T>(sf),
lattice.getBoundingBox(),lattice,p);
vtkOut.writeData<float>(p,"solidfraction",1. );
pcout << "wrote " << fname << std::endl;
}
void channelSetup( MultiBlockLattice3D<T,DESCRIPTOR>& lattice,
IncomprFlowParam<T> const& parameters,
OnLatticeBoundaryCondition3D<T,DESCRIPTOR>& boundaryCondition )
{
// Create Velocity boundary conditions
boundaryCondition.setVelocityConditionOnBlockBoundaries(lattice);
setBoundaryVelocity (
lattice, lattice.getBoundingBox(),
PoiseuilleVelocity<T>(parameters) );
lattice.initialize();
}
int main(int argc, char* argv[]) {
plbInit(&argc, &argv);
//defaultMultiBlockPolicy3D().toggleBlockingCommunication(true);
plint N;
try {
global::argv(1).read(N);
}
catch(...)
{
pcout << "Wrong parameters. The syntax is " << std::endl;
pcout << argv[0] << " N" << std::endl;
pcout << "where N is the resolution. The benchmark cases published " << std::endl;
pcout << "on the Palabos Wiki use N=100, N=400, N=1000, or N=4000." << std::endl;
exit(1);
}
pcout << "Starting benchmark with " << N+1 << "x" << N+1 << "x" << N+1 << " grid points "
<< "(approx. 2 minutes on modern processors)." << std::endl;
IncomprFlowParam<T> parameters(
(T) 1e-2, // uMax
(T) 1., // Re
N, // N
1., // lx
1., // ly
1. // lz
);
MultiBlockLattice3D<T, DESCRIPTOR> lattice (
parameters.getNx(), parameters.getNy(), parameters.getNz(),
new BGKdynamics<T,DESCRIPTOR>(parameters.getOmega()) );
plint numCores = global::mpi().getSize();
pcout << "Number of MPI threads: " << numCores << std::endl;
// Current cores run approximately at 5 Mega Sus.
T estimateSus= 5.e6*numCores;
// The benchmark should run for approximately two minutes
// (2*60 seconds).
T wishNumSeconds = 60.;
plint numCells = lattice.getBoundingBox().nCells();
// Run at least three iterations.
plint numIter = std::max( (plint)3,
(plint)(estimateSus*wishNumSeconds/numCells+0.5));
OnLatticeBoundaryCondition3D<T,DESCRIPTOR>* boundaryCondition
= createLocalBoundaryCondition3D<T,DESCRIPTOR>();
cavitySetup(lattice, parameters, *boundaryCondition);
// Run the benchmark once "to warm up the machine".
for (plint iT=0; iT<numIter; ++iT) {
lattice.collideAndStream();
}
// Run the benchmark for good.
global::timer("benchmark").start();
global::profiler().turnOn();
for (plint iT=0; iT<numIter; ++iT) {
lattice.collideAndStream();
}
pcout << "After " << numIter << " iterations: "
<< (T) (numCells*numIter) /
global::timer("benchmark").getTime() / 1.e6
<< " Mega site updates per second." << std::endl << std::endl;
global::profiler().writeReport();
delete boundaryCondition;
}
int main(int argc, char* argv[]) {
plbInit(&argc, &argv);
global::directories().setOutputDir("./tmp/");
IncomprFlowParam<T> parameters(
(T) 1e-2, // uMax
(T) 10., // Re
30, // N
1., // lx
1., // ly
1. // lz
);
const T logT = (T)1/(T)100;
const T imSave = (T)1/(T)10;
const T vtkSave = (T)1;
const T maxT = (T)10.1;
pcout << "omega= " << parameters.getOmega() << std::endl;
writeLogFile(parameters, "3D diagonal cavity");
T omega = parameters.getOmega();
#ifdef USE_MRT
plint mrtId = 0;
mrtParam<T,DESCRIPTOR>().set(mrtId,MRTparam<T,DESCRIPTOR>(omega));
#endif
MultiBlockLattice3D<T, DESCRIPTOR> lattice (
parameters.getNx(), parameters.getNy(), parameters.getNz(), DYNAMICS );
#ifdef USE_ASINARI
integrateProcessingFunctional(new AsinariPostCollide3D<T,DESCRIPTOR>, lattice.getBoundingBox(), lattice, 0);
#endif
OnLatticeBoundaryCondition3D<T,DESCRIPTOR>* boundaryCondition
//= createInterpBoundaryCondition3D<T,DESCRIPTOR>();
= createLocalBoundaryCondition3D<T,DESCRIPTOR>();
cavitySetup(lattice, parameters, *boundaryCondition);
T previousIterationTime = T();
// Loop over main time iteration.
for (plint iT=0; iT<parameters.nStep(maxT); ++iT) {
global::timer("mainLoop").restart();
if (iT%parameters.nStep(imSave)==0) {
pcout << "Writing Gif ..." << endl;
writeGifs(lattice, parameters, iT);
}
if (iT%parameters.nStep(vtkSave)==0 && iT>0) {
pcout << "Saving VTK file ..." << endl;
writeVTK(lattice, parameters, iT);
}
if (iT%parameters.nStep(logT)==0) {
pcout << "step " << iT
<< "; t=" << iT*parameters.getDeltaT();
}
// Execute a time iteration.
lattice.collideAndStream();
// Access averages from internal statistics ( their value is defined
// only after the call to lattice.collideAndStream() )
if (iT%parameters.nStep(logT)==0) {
pcout << "; av energy="
<< setprecision(10) << getStoredAverageEnergy<T>(lattice)
<< "; av rho="
<< setprecision(10) << getStoredAverageDensity<T>(lattice) << endl;
pcout << "Time spent during previous iteration: "
<< previousIterationTime << endl;
}
previousIterationTime = global::timer("mainLoop").stop();
}
delete boundaryCondition;
}
void writeVTK(MultiBlockLattice3D<T,DESCRIPTOR>& lattice, plint iter){
VtkImageOutput3D<T> vtkOut(createFileName("vtk", iter, 6), 1.);
vtkOut.writeData<float>(*computeDensity(lattice), "density", 1.);
std::auto_ptr<MultiScalarField3D<T> > velocity(plb::computeVelocityComponent(lattice, lattice.getBoundingBox(), 2));
vtkOut.writeData<T>(*velocity, "velocity", 1.);
}
int main(int argc, char* argv[]) {
plbInit(&argc, &argv);
T uMax;
plint N;
T nu_f,d_part,v_frac, v_inf;
std::string outDir;
try {
global::argv(1).read(d_part);
global::argv(2).read(N);
global::argv(3).read(v_frac);
global::argv(4).read(nu_f);
global::argv(5).read(v_inf);
global::argv(6).read(uMax);
global::argv(7).read(outDir);
} catch(PlbIOException& exception) {
pcout << exception.what() << endl;
pcout << "Command line arguments:\n";
pcout << "1 : d_part\n";
pcout << "2 : N per particle diameter\n";
pcout << "3 : particle volume fraction\n";
pcout << "4 : nu_fluid\n";
pcout << "5 : estimated v_inf\n";
pcout << "6 : uMax\n";
pcout << "7 : outDir\n";
exit(1);
}
std::string lbOutDir(outDir), demOutDir(outDir);
lbOutDir.append("tmp/");
demOutDir.append("post/");
global::directories().setOutputDir(lbOutDir);
const T rho_f = 1000;
LiggghtsCouplingWrapper wrapper(argv,global::mpi().getGlobalCommunicator());
// particle size and volume fraction are handed over to LIGGGHTS
// as variables (see LIGGGHTS docu for details)
wrapper.setVariable("r_part",d_part/2);
wrapper.setVariable("v_frac",v_frac);
wrapper.execFile("in.lbdem");
T g = 9.81;
const T lx = 1., ly = 1., lz = 2.;
T r_ = d_part/2.;
T rho_s = 1100.;
T m = r_*r_*r_*4./3.*3.14*rho_s;
PhysUnits3D<T> units(2.*r_,v_inf,nu_f,lx,ly,lz,N,uMax,rho_f);
IncomprFlowParam<T> parameters(units.getLbParam());
plint nx = parameters.getNx(), ny = parameters.getNy(), nz = parameters.getNz();
// get lattice decomposition from LIGGGHTS and create lattice according to parallelization
// given in the LIGGGHTS input script
LatticeDecomposition lDec(parameters.getNx(),parameters.getNy(),parameters.getNz(),
wrapper.lmp);
SparseBlockStructure3D blockStructure = lDec.getBlockDistribution();
ExplicitThreadAttribution* threadAttribution = lDec.getThreadAttribution();
plint envelopeWidth = 1;
MultiBlockLattice3D<T, DESCRIPTOR>
lattice (MultiBlockManagement3D (blockStructure, threadAttribution, envelopeWidth ),
defaultMultiBlockPolicy3D().getBlockCommunicator(),
defaultMultiBlockPolicy3D().getCombinedStatistics(),
defaultMultiBlockPolicy3D().getMultiCellAccess<T,DESCRIPTOR>(),
new DYNAMICS );
defineDynamics(lattice,lattice.getBoundingBox(),new DYNAMICS);
const T maxT = ceil(3.*lz/v_inf);
const T vtkT = 0.1;
const T logT = 0.0000001;
const plint maxSteps = units.getLbSteps(maxT);
const plint vtkSteps = max<plint>(units.getLbSteps(vtkT),1);
const plint logSteps = max<plint>(units.getLbSteps(logT),1);
writeLogFile(parameters, "sedimenting spheres benchmark");
lattice.initialize();
T dt_phys = units.getPhysTime(1);
plint demSubsteps = 10;
T dt_dem = dt_phys/(T)demSubsteps;
pcout << "------------------------------\n"
<< "omega: " << parameters.getOmega() << "\n"
<< "dt_phys: " << dt_phys << "\n"
<< "maxT: " << maxT << " | maxSteps: " << maxSteps << "\n"
<< "v_inf: " << v_inf << "\n"
<< "Re : " << parameters.getRe() << "\n"
<< "vtkT: " << vtkT << " | vtkSteps: " << vtkSteps << "\n"
<< "grid size: " << nx << " " << ny << " " << nz << "\n"
<< "------------------------------" << std::endl;
// set timestep and output directory
wrapper.setVariable("t_step",dt_dem);
wrapper.setVariable("dmp_stp",vtkSteps*demSubsteps);
wrapper.setVariable("dmp_dir",demOutDir);
wrapper.execFile("in2.lbdem");
wrapper.runUpto(demSubsteps-1);
clock_t start = clock();
clock_t loop = clock();
clock_t end = clock();
// Loop over main time iteration.
for (plint iT=0; iT<=maxSteps; ++iT) {
bool initWithVel = false;
setSpheresOnLattice(lattice,wrapper,units,initWithVel);
if(iT%vtkSteps == 0 && iT > 0) // LIGGGHTS does not write at timestep 0
writeVTK(lattice,parameters,units,iT);
lattice.collideAndStream();
getForcesFromLattice(lattice,wrapper,units);
wrapper.run(demSubsteps);
if(iT%logSteps == 0) {
end = clock();
T time = difftime(end,loop)/((T)CLOCKS_PER_SEC);
T totaltime = difftime(end,start)/((T)CLOCKS_PER_SEC);
T mlups = ((T) (lattice.getNx()*lattice.getNy()*lattice.getNz()*logSteps))/time/1e6;
pcout << "time: " << time << " " ;
pcout << "calculating at " << mlups << " MLU/s"
<< " | total time running: " << totaltime << std::endl;
loop = clock();
}
}
T totaltime = difftime(end,start)/((T)CLOCKS_PER_SEC);
T totalmlups = ((T) (lattice.getNx()*lattice.getNy()*lattice.getNz()*(maxSteps+1)))/totaltime/1e6;
pcout << " ********************** \n"
<< "total time: " << totaltime
<< " calculating at " << totalmlups << " MLU/s" << std::endl;
}
void runProgram()
{
/*
* Read the obstacle geometry.
*/
pcout << std::endl << "Reading STL data for the obstacle geometry." << std::endl;
Array<T,3> center(param.cx, param.cy, param.cz);
Array<T,3> centerLB(param.cxLB, param.cyLB, param.czLB);
// The triangle-set defines the surface of the geometry.
TriangleSet<T> triangleSet(param.geometry_fname, DBL);
// Place the obstacle in the correct place in the simulation domain.
// Here the "geometric center" of the obstacle is computed manually,
// by computing first its bounding cuboid. In cases that the STL
// file with the geometry of the obstacle contains its center as
// the point, say (0, 0, 0), then the following variable
// "obstacleCenter" must be set to (0, 0, 0) manually.
Cuboid<T> bCuboid = triangleSet.getBoundingCuboid();
Array<T,3> obstacleCenter = 0.5 * (bCuboid.lowerLeftCorner + bCuboid.upperRightCorner);
triangleSet.translate(-obstacleCenter);
triangleSet.scale(1.0/param.dx); // In lattice units from now on...
triangleSet.translate(centerLB);
triangleSet.writeBinarySTL(outputDir+"obstacle_LB.stl");
// The DEFscaledMesh, and the triangle-boundary are more sophisticated data
// structures used internally by Palabos to treat the boundary.
plint xDirection = 0;
plint borderWidth = 1; // Because Guo acts in a one-cell layer.
// Requirement: margin>=borderWidth.
plint margin = 1; // Extra margin of allocated cells around the obstacle, for the case of moving walls.
plint blockSize = 0; // Size of blocks in the sparse/parallel representation.
// Zero means: don't use sparse representation.
DEFscaledMesh<T> defMesh(triangleSet, 0, xDirection, margin, Dot3D(0, 0, 0));
TriangleBoundary3D<T> boundary(defMesh);
//boundary.getMesh().inflate();
pcout << "tau = " << 1.0/param.omega << std::endl;
pcout << "dx = " << param.dx << std::endl;
pcout << "dt = " << param.dt << std::endl;
pcout << "Number of iterations in an integral time scale: " << (plint) (1.0/param.dt) << std::endl;
/*
* Voxelize the domain.
*/
// Voxelize the domain means: decide which lattice nodes are inside the obstacle and which are outside.
pcout << std::endl << "Voxelizing the domain." << std::endl;
plint extendedEnvelopeWidth = 2; // Extrapolated off-lattice BCs.
const int flowType = voxelFlag::outside;
VoxelizedDomain3D<T> voxelizedDomain (
boundary, flowType, param.boundingBox(), borderWidth, extendedEnvelopeWidth, blockSize );
pcout << getMultiBlockInfo(voxelizedDomain.getVoxelMatrix()) << std::endl;
/*
* Generate the lattice, the density and momentum blocks.
*/
pcout << "Generating the lattice, the rhoBar and j fields." << std::endl;
MultiBlockLattice3D<T,DESCRIPTOR> *lattice = new MultiBlockLattice3D<T,DESCRIPTOR>(voxelizedDomain.getVoxelMatrix());
if (param.useSmago) {
defineDynamics(*lattice, lattice->getBoundingBox(),
new SmagorinskyBGKdynamics<T,DESCRIPTOR>(param.omega, param.cSmago));
pcout << "Using Smagorinsky BGK dynamics." << std::endl;
} else {
defineDynamics(*lattice, lattice->getBoundingBox(),
new BGKdynamics<T,DESCRIPTOR>(param.omega));
pcout << "Using BGK dynamics." << std::endl;
}
bool velIsJ = false;
defineDynamics(*lattice, voxelizedDomain.getVoxelMatrix(), lattice->getBoundingBox(),
new NoDynamics<T,DESCRIPTOR>(), voxelFlag::inside);
lattice->toggleInternalStatistics(false);
MultiBlockManagement3D sparseBlockManagement(lattice->getMultiBlockManagement());
// The rhoBar and j fields are used at both the collision and at the implementation of the
// outflow boundary condition.
plint envelopeWidth = 1;
MultiScalarField3D<T> *rhoBar = new MultiScalarField3D<T> (
MultiBlockManagement3D (
sparseBlockManagement.getSparseBlockStructure(),
sparseBlockManagement.getThreadAttribution().clone(),
envelopeWidth ),
defaultMultiBlockPolicy3D().getBlockCommunicator(),
defaultMultiBlockPolicy3D().getCombinedStatistics(),
defaultMultiBlockPolicy3D().getMultiScalarAccess<T>() );
rhoBar->toggleInternalStatistics(false);
MultiTensorField3D<T,3> *j = new MultiTensorField3D<T,3> (
MultiBlockManagement3D (
sparseBlockManagement.getSparseBlockStructure(),
sparseBlockManagement.getThreadAttribution().clone(),
envelopeWidth ),
defaultMultiBlockPolicy3D().getBlockCommunicator(),
defaultMultiBlockPolicy3D().getCombinedStatistics(),
defaultMultiBlockPolicy3D().getMultiTensorAccess<T,3>() );
j->toggleInternalStatistics(false);
std::vector<MultiBlock3D*> lattice_rho_bar_j_arg;
lattice_rho_bar_j_arg.push_back(lattice);
lattice_rho_bar_j_arg.push_back(rhoBar);
lattice_rho_bar_j_arg.push_back(j);
integrateProcessingFunctional(
new ExternalRhoJcollideAndStream3D<T,DESCRIPTOR>(),
lattice->getBoundingBox(), lattice_rho_bar_j_arg, 0);
integrateProcessingFunctional(
new BoxRhoBarJfunctional3D<T,DESCRIPTOR>(),
lattice->getBoundingBox(), lattice_rho_bar_j_arg, 3); // rhoBar and j are computed at level 3 because
// the boundary conditions are on levels 1 and 2.
/*
* Generate the off-lattice boundary condition on the obstacle and the outer-domain boundary conditions.
*/
pcout << "Generating boundary conditions." << std::endl;
OffLatticeBoundaryCondition3D<T,DESCRIPTOR,Velocity> *boundaryCondition;
BoundaryProfiles3D<T,Velocity> profiles;
bool useAllDirections=true;
OffLatticeModel3D<T,Velocity>* offLatticeModel=0;
if (param.freeSlipWall) {
profiles.setWallProfile(new FreeSlipProfile3D<T>);
}
else {
profiles.setWallProfile(new NoSlipProfile3D<T>);
}
offLatticeModel =
new GuoOffLatticeModel3D<T,DESCRIPTOR> (
new TriangleFlowShape3D<T,Array<T,3> >(voxelizedDomain.getBoundary(), profiles),
flowType, useAllDirections );
offLatticeModel->setVelIsJ(velIsJ);
boundaryCondition = new OffLatticeBoundaryCondition3D<T,DESCRIPTOR,Velocity>(
offLatticeModel, voxelizedDomain, *lattice);
boundaryCondition->insert();
// The boundary condition algorithm or the outer domain.
OnLatticeBoundaryCondition3D<T,DESCRIPTOR>* outerBoundaryCondition
= createLocalBoundaryCondition3D<T,DESCRIPTOR>();
outerDomainBoundaries(lattice, rhoBar, j, outerBoundaryCondition);
/*
* Implement the outlet sponge zone.
*/
if (param.numOutletSpongeCells > 0) {
T bulkValue;
Array<plint,6> numSpongeCells;
if (param.outletSpongeZoneType == 0) {
pcout << "Generating an outlet viscosity sponge zone." << std::endl;
bulkValue = param.omega;
} else if (param.outletSpongeZoneType == 1) {
pcout << "Generating an outlet Smagorinsky sponge zone." << std::endl;
bulkValue = param.cSmago;
} else {
pcout << "Error: unknown type of sponge zone." << std::endl;
exit(-1);
}
// Number of sponge zone lattice nodes at all the outer domain boundaries.
// So: 0 means the boundary at x = 0
// 1 means the boundary at x = nx-1
// 2 means the boundary at y = 0
// and so on...
numSpongeCells[0] = 0;
numSpongeCells[1] = param.numOutletSpongeCells;
numSpongeCells[2] = 0;
numSpongeCells[3] = 0;
numSpongeCells[4] = 0;
numSpongeCells[5] = 0;
std::vector<MultiBlock3D*> args;
args.push_back(lattice);
if (param.outletSpongeZoneType == 0) {
applyProcessingFunctional(new ViscositySpongeZone<T,DESCRIPTOR>(
param.nx, param.ny, param.nz, bulkValue, numSpongeCells),
lattice->getBoundingBox(), args);
} else {
applyProcessingFunctional(new SmagorinskySpongeZone<T,DESCRIPTOR>(
param.nx, param.ny, param.nz, bulkValue, param.targetSpongeCSmago, numSpongeCells),
lattice->getBoundingBox(), args);
}
}
/*
* Setting the initial conditions.
*/
// Initial condition: Constant pressure and velocity-at-infinity everywhere.
Array<T,3> uBoundary(param.getInletVelocity(0), 0.0, 0.0);
initializeAtEquilibrium(*lattice, lattice->getBoundingBox(), 1.0, uBoundary);
applyProcessingFunctional(
new BoxRhoBarJfunctional3D<T,DESCRIPTOR>(),
lattice->getBoundingBox(), lattice_rho_bar_j_arg); // Compute rhoBar and j before VirtualOutlet is executed.
lattice->executeInternalProcessors(1); // Execute all processors except the ones at level 0.
lattice->executeInternalProcessors(2);
lattice->executeInternalProcessors(3);
/*
* Particles (streamlines).
*/
// This part of the code that relates to particles, is purely for visualization
// purposes. Particles are used to compute streamlines essentially.
// Definition of a particle field.
MultiParticleField3D<ParticleFieldT>* particles = 0;
if (param.useParticles) {
particles = new MultiParticleField3D<ParticleFieldT> (
lattice->getMultiBlockManagement(),
defaultMultiBlockPolicy3D().getCombinedStatistics() );
std::vector<MultiBlock3D*> particleArg;
particleArg.push_back(particles);
std::vector<MultiBlock3D*> particleFluidArg;
particleFluidArg.push_back(particles);
particleFluidArg.push_back(lattice);
// Functional that advances the particles to their new position at each predefined time step.
integrateProcessingFunctional (
new AdvanceParticlesEveryWhereFunctional3D<T,DESCRIPTOR>(param.cutOffSpeedSqr),
lattice->getBoundingBox(), particleArg, 0);
// Functional that assigns the particle velocity according to the particle's position in the fluid.
integrateProcessingFunctional (
new FluidToParticleCoupling3D<T,DESCRIPTOR>((T) param.particleTimeFactor),
lattice->getBoundingBox(), particleFluidArg, 1 );
// Definition of a domain from which particles will be injected in the flow field.
Box3D injectionDomain(0, 0, centerLB[1]-0.25*param.ny, centerLB[1]+0.25*param.ny,
centerLB[2]-0.25*param.nz, centerLB[2]+0.25*param.nz);
// Definition of simple mass-less particles.
Particle3D<T,DESCRIPTOR>* particleTemplate=0;
particleTemplate = new PointParticle3D<T,DESCRIPTOR>(0, Array<T,3>(0.,0.,0.), Array<T,3>(0.,0.,0.));
// Functional which injects particles with predefined probability from the specified injection domain.
std::vector<MultiBlock3D*> particleInjectionArg;
particleInjectionArg.push_back(particles);
integrateProcessingFunctional (
new InjectRandomParticlesFunctional3D<T,DESCRIPTOR>(particleTemplate, param.particleProbabilityPerCell),
injectionDomain, particleInjectionArg, 0 );
// Definition of an absorbtion domain for the particles.
Box3D absorbtionDomain(param.outlet);
// Functional which absorbs the particles which reach the specified absorbtion domain.
integrateProcessingFunctional (
new AbsorbParticlesFunctional3D<T,DESCRIPTOR>, absorbtionDomain, particleArg, 0 );
particles->executeInternalProcessors();
}
/*
* Starting the simulation.
*/
plb_ofstream energyFile((outputDir+"average_energy.dat").c_str());
pcout << std::endl;
pcout << "Starting simulation." << std::endl;
for (plint i = 0; i < param.maxIter; ++i) {
if (i <= param.initialIter) {
Array<T,3> uBoundary(param.getInletVelocity(i), 0.0, 0.0);
setBoundaryVelocity(*lattice, param.inlet, uBoundary);
}
if (i % param.statIter == 0) {
pcout << "At iteration " << i << ", t = " << i*param.dt << std::endl;
Array<T,3> force(boundaryCondition->getForceOnObject());
T factor = util::sqr(util::sqr(param.dx)) / util::sqr(param.dt);
pcout << "Force on object over fluid density: F[x] = " << force[0]*factor << ", F[y] = "
<< force[1]*factor << ", F[z] = " << force[2]*factor << std::endl;
T avEnergy = boundaryCondition->computeAverageEnergy() * util::sqr(param.dx) / util::sqr(param.dt);
pcout << "Average kinetic energy over fluid density: E = " << avEnergy << std::endl;
energyFile << i*param.dt << " " << avEnergy << std::endl;
pcout << std::endl;
}
if (i % param.vtkIter == 0) {
pcout << "Writing VTK at time t = " << i*param.dt << endl;
writeVTK(*boundaryCondition, i);
if (param.useParticles) {
writeParticleVtk<T,DESCRIPTOR> (
*particles, createFileName(outputDir+"particles_", i, PADDING) + ".vtk",
param.maxNumParticlesToWrite );
}
}
if (i % param.imageIter == 0) {
pcout << "Writing PPM image at time t = " << i*param.dt << endl;
writePPM(*boundaryCondition, i);
}
lattice->executeInternalProcessors();
lattice->incrementTime();
if (param.useParticles && i % param.particleTimeFactor == 0) {
particles->executeInternalProcessors();
}
}
energyFile.close();
delete outerBoundaryCondition;
delete boundaryCondition;
if (param.useParticles) {
delete particles;
}
delete j;
delete rhoBar;
delete lattice;
}