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/");
PlbT Re(600.,600*1e-3);
pcout << Re.real() <<" "<<Re.imaginary()<<endl;
IncomprFlowParam<PlbT> parameters(
(PlbT) 1e-2, // uMax
(PlbT) Re, // Re
100, // N
6., // lx
1. // ly
);
const T logT = (T)0.02;
const T imSave = (T)0.06;
const T vtkSave = (T)0.06;
const T maxT = (T)20.1;
pcout<<" " << parameters.getDeltaT().imaginary()<<endl;
//writeLogFile(parameters, "Poiseuille flow");
MultiBlockLattice2D<PlbT, DESCRIPTOR> lattice (
parameters.getNx(), parameters.getNy(),
new BGKdynamics<PlbT,DESCRIPTOR>(parameters.getOmega()) );
pcout << parameters.getOmega().real()<<" "<< parameters.getOmega().imaginary()<< endl;
OnLatticeBoundaryCondition2D<PlbT,DESCRIPTOR>*
boundaryCondition = createLocalBoundaryCondition2D<PlbT,DESCRIPTOR>();
cylinderSetup(lattice, parameters, *boundaryCondition);
//Array<PlbT,2> velocity;
// lattice.get(10, 10).computeVelocity(velocity);
// pcout << "Velocity in the middle of the lattice: ("
// << velocity[0].real()<<" "<<velocity[0].imaginary() << "," << velocity[1].real()<<" "<<velocity[1].imaginary() << ")" << endl;
// Main loop over time iterations.
for (plint iT=0; (T)iT*parameters.getDeltaT().real()<maxT; ++iT) {
// At this point, the state of the lattice corresponds to the
// discrete time iT. However, the stored averages (getStoredAverageEnergy
// and getStoredAverageDensity) correspond to the previous time iT-1.
if (iT%parameters.nStep(imSave)==0) {
//pcout << "Saving Gif ..." << endl;
//writeGif(lattice, iT);
}
//if (iT%parameters.nStep(vtkSave)==0 && iT>=0) {
// pcout << "Saving VTK file ..." << endl;
// writeVTK(lattice, parameters, iT);
//}
if (iT%parameters.nStep(vtkSave)==0 && iT>=0) {
pcout << "Saving VTK file ..." << endl;
writeVTK(lattice, parameters, iT);
Array<PlbT,2> velocity;
lattice.get(10, 10).computeVelocity(velocity);
pcout << "Velocity in the middle of the lattice: ("
<< velocity[0].real()<<" "<<velocity[0].imaginary() << "," << velocity[1].real()<<" "<<velocity[1].imaginary() << ")" << endl;
}
if (iT%parameters.nStep(logT)==0) {
pcout << "step " << iT
<< "; t=" << (T)iT*parameters.getDeltaT().real();
}
// Lattice Boltzmann iteration step.
lattice.collideAndStream();
// lattice.get(10, 10).computeVelocity(velocity);
// pcout << "Velocity in the middle of the lattice: ("
// << velocity[0].real()<<" "<<velocity[0].imaginary() << "," << velocity[1].real()<<" "<<velocity[1].imaginary() << ")" << endl;
// At this point, the state of the lattice corresponds to the
// discrete time iT+1, and the stored averages are upgraded to time iT.
if (iT%parameters.nStep(logT)==0) {
pcout << "; av energy ="
<< setprecision(10) << getStoredAverageEnergy<PlbT>(lattice)
<< "; av rho ="
<< getStoredAverageDensity<PlbT>(lattice) << endl;
}
}
delete boundaryCondition;
}