Ejemplo n.º 1
0
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();
}
Ejemplo n.º 2
0
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();
}
Ejemplo n.º 3
0
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();
}
Ejemplo n.º 4
0
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 everythingButTopLid = Box3D(0, nx-1, 0, ny-2, 0, nz-1);

    boundaryCondition.setVelocityConditionOnBlockBoundaries(lattice);

    T u = std::sqrt((T)2)/(T)2 * parameters.getLatticeU();
    initializeAtEquilibrium(lattice, everythingButTopLid, (T)1., Array<T,3>((T)0.,(T)0.,(T)0.) );
    initializeAtEquilibrium(lattice, topLid, (T)1., Array<T,3>(u,(T)0.,u) );
    setBoundaryVelocity(lattice, topLid, Array<T,3>(u,(T)0.,u) );

    lattice.initialize();
}
Ejemplo n.º 5
0
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;

}