int main(int argc, char* argv[]) {
plbInit(&argc, &argv);
global::directories().setOutputDir("./tmp/");
MultiBlockLattice2D<T, DESCRIPTOR> lattice (
nx, ny, new BGKdynamics<T,DESCRIPTOR>(omega) );
lattice.periodicity().toggleAll(true); // Set periodic boundaries.
defineInitialDensityAtCenter(lattice);
// First part: loop over time iterations.
for (plint iT=0; iT<maxIter; ++iT) {
lattice.collideAndStream();
}
// Second part: Data analysis.
Array<T,2> velocity;
lattice.get(nx/2, ny/2).computeVelocity(velocity);
pcout << "Velocity in the middle of the lattice: ("
<< velocity[0] << "," << velocity[1] << ")" << endl;
pcout << "Velocity norm along a horizontal line: " << endl;
Box2D line(0, 100, ny/2, ny/2);
pcout << setprecision(3) << *computeVelocityNorm(*extractSubDomain(lattice, line)) << endl;
plb_ofstream ofile("profile.dat");
ofile << setprecision(3) << *computeVelocityNorm(*extractSubDomain(lattice, line)) << endl;
pcout << "Average density in the domain: " << computeAverageDensity(lattice) << endl;
pcout << "Average energy in the domain: " << computeAverageEnergy(lattice) << endl;
}
int main(int argc, char *argv[])
{
plbInit(&argc, &argv);
global::directories().setOutputDir("./tmp/");
// For the choice of the parameters G, rho0, and psi0, we refer to the book
// Michael C. Sukop and Daniel T. Thorne (2006),
// Lattice Boltzmann Modeling; an Introduction for Geoscientists and Engineers.
// Springer-Verlag Berlin/Heidelberg.
const T omega = 1.0;
const int nx = 400;
const int ny = 400;
const T G = -120.0;
const int maxIter = 100001;
const int saveIter = 100;
const int statIter = 100;
const T rho0 = 200.0;
const T deltaRho = 1.0;
const T psi0 = 4.0;
MultiBlockLattice2D<T, DESCRIPTOR> lattice (
nx,ny, new ExternalMomentBGKdynamics<T, DESCRIPTOR>(omega) );
lattice.periodicity().toggleAll(true);
// Use a random initial condition, to activate the phase separation.
applyProcessingFunctional(new RandomInitializer<T,DESCRIPTOR>(rho0,deltaRho),
lattice.getBoundingBox(),lattice);
// Add the data processor which implements the Shan/Chen interaction potential.
plint processorLevel = 1;
integrateProcessingFunctional (
new ShanChenSingleComponentProcessor2D<T,DESCRIPTOR> (
G, new interparticlePotential::PsiShanChen94<T>(psi0,rho0) ),
lattice.getBoundingBox(), lattice, processorLevel );
lattice.initialize();
pcout << "Starting simulation" << endl;
for (int iT=0; iT<maxIter; ++iT) {
if (iT%statIter==0) {
auto_ptr<MultiScalarField2D<T> > rho( computeDensity(lattice) );
pcout << iT << ": Average rho fluid one = " << computeAverage(*rho) << endl;
pcout << "Minimum density: " << computeMin(*rho) << endl;
pcout << "Maximum density: " << computeMax(*rho) << endl;
}
if (iT%saveIter == 0) {
ImageWriter<T>("leeloo").writeScaledGif (
createFileName("rho", iT, 6), *computeDensity(lattice) );
}
lattice.collideAndStream();
}
}
int main(int argc, char* argv[]) {
plbInit(&argc, &argv);
global::directories().setOutputDir("./tmp/");
IncomprFlowParam<T> parameters(
(T) 1e-2, // uMax
(T) 300., // Re
100, // N
5., // lx
1. // ly
);
const T logT = (T)0.02;
const T imSave = (T)0.1;
const T vtkSave = (T)3.;
const T maxT = (T)10.1;
writeLogFile(parameters, "Poiseuille flow");
MultiBlockLattice2D<T, DESCRIPTOR> lattice (
parameters.getNx(), parameters.getNy(),
new BGKdynamics<T,DESCRIPTOR>(parameters.getOmega()) );
lattice.periodicity().toggle(0, false);
OnLatticeBoundaryCondition2D<T,DESCRIPTOR>*
//boundaryCondition = createInterpBoundaryCondition2D<T,DESCRIPTOR>();
boundaryCondition = createLocalBoundaryCondition2D<T,DESCRIPTOR>();
defineCylinderGeometry(lattice, parameters);
setupInletAndBulk(lattice, parameters, *boundaryCondition);
//copyUnknownOnOutlet(lattice, parameters, *boundaryCondition);
velocityNeumannOutlet(lattice, parameters, *boundaryCondition);
lattice.initialize();
// Main loop over time iterations.
for (plint iT=0; iT*parameters.getDeltaT()<maxT; ++iT) {
if ((iT+1)%parameters.nStep(logT)==0) {
pcout << computeAverageDensity(lattice) << endl;
pcout << computeAverageEnergy(lattice) << endl;
}
if (iT%parameters.nStep(logT)==0) {
pcout << "step " << iT
<< "; lattice time=" << lattice.getTimeCounter().getTime()
<< "; t=" << iT*parameters.getDeltaT()
<< "; av energy="
<< setprecision(10) << getStoredAverageEnergy<T>(lattice)
<< "; av rho="
<< getStoredAverageDensity<T>(lattice) << endl;
}
if (iT%parameters.nStep(imSave)==0) {
pcout << "Saving Gif ..." << endl;
writeGifs(lattice, iT);
}
if (iT%parameters.nStep(vtkSave)==0 && iT>0) {
pcout << "Saving VTK file ..." << endl;
writeVTK(lattice, parameters, iT);
}
// Lattice Boltzmann iteration step.
lattice.collideAndStream();
}
delete boundaryCondition;
}
int main(int argc, char *argv[])
{
plbInit(&argc, &argv);
if (argc != 2)
{
pcout << "Error : Wrong parameters specified." << endl;
pcout << "1 : N." << endl;
exit(1);
}
const plint N = atoi(argv[1]);
const T Re = 1.0;
const T alpha = 1.0; // womersley number
const plint Nref = 10;
const T uMaxRef = 0.01;
const T uMax = uMaxRef /(T)N * (T)Nref; // needed to avoid compressibility errors.
const T lx = 100.0;
const T ly = 1.0;
pcout << "uMaxRef=" << uMaxRef << std::endl;
pcout << "uMax=" << uMax << std::endl;
global::directories().setOutputDir("./tmp/");
IncomprFlowParam<T> parameters(uMax, Re, N, lx, ly);
// The frequency of the force (lattice units)
T frequency = (T)4*alpha*alpha*parameters.getLatticeNu()
/ (T)(parameters.getResolution()*parameters.getResolution());
// The amplitude of the forcing term (lattice units)
T amplitude = 8. * parameters.getLatticeNu() * parameters.getLatticeU()
/ ( (T)(parameters.getResolution()*parameters.getResolution()) );
// Period of the force (lattice units)
plint tPeriod = (plint)((T)2*pi/frequency + 0.5);
writeLogFile(parameters,"palabos.log");
plint nx = parameters.getNx();
plint ny = parameters.getNy();
T omega = parameters.getOmega();
MultiBlockLattice2D<T, NSDESCRIPTOR> lattice (
nx,ny,new DYNAMICS );
OnLatticeBoundaryCondition2D<T,NSDESCRIPTOR>*
boundaryCondition = createLocalBoundaryCondition2D<T,NSDESCRIPTOR>();
lattice.periodicity().toggle(0,true);
channelSetup( lattice, parameters, *boundaryCondition, alpha, frequency, amplitude);
pcout << "Starting simulation" << endl;
const plint maxIter = tPeriod * 100;
//const plint tSave = tPeriod / 24;
T error = T();
lattice.getTimeCounter().resetTime(1);
pcout << "Omega = " << omega << ", it period = " << tPeriod << endl;
util::ValueTracer<T> converge(uMax,N,1.0e-3);
plint iT = 0;
for (iT = 0; iT < maxIter; ++iT) {
// Updating the force in the whole domain
Array<T,NSDESCRIPTOR<T>::d> force(womersleyForce((T)iT, amplitude, frequency, parameters),0.);
setExternalVector(lattice,lattice.getBoundingBox(),
NSDESCRIPTOR<T>::ExternalField::forceBeginsAt,force);
T errorTemp = computeRMSerror( lattice,parameters,alpha,iT);
error += errorTemp;
//if (iT % tSave == 0) {
// pcout << "Writing Gif at time : " << iT << std::endl;
// writeGif(lattice,iT);
//}
if (iT % tPeriod == 0)
{
// The error is averaged over one period
error /= (T)(tPeriod);
pcout << "For N = " << N << ", Error = " << error << endl;
converge.takeValue(error,true);
if (converge.hasConverged())
{
cout << "Simulation converged!\n";
break;
}
error = T();
}
lattice.collideAndStream();
}
pcout << "For N = " << N << ", Error = " << computeRMSerror ( lattice,parameters,alpha,iT, true) << endl;
}
