void cavitySetup( BlockLatticeBase2D<T,DESCRIPTOR>& lattice,
IncomprFlowParam<T> const& parameters,
OnLatticeBoundaryCondition2D<T,DESCRIPTOR>& boundaryCondition )
{
const plint nx = parameters.getNx();
const plint ny = parameters.getNy();
boundaryCondition.setVelocityConditionOnBlockBoundaries(lattice);
setBoundaryVelocity(lattice, lattice.getBoundingBox(), Array<T,2>(0.,0.) );
initializeAtEquilibrium(lattice, lattice.getBoundingBox(), 1., Array<T,2>(0.,0.) );
T u = parameters.getLatticeU();
setBoundaryVelocity(lattice, Box2D(1, nx-2, ny-1, ny-1), Array<T,2>(u,0.) );
initializeAtEquilibrium(lattice, Box2D(1, nx-2, ny-1, ny-1), 1., Array<T,2>(u,0.) );
lattice.initialize();
}
/// A functional, used to instantiate bounce-back nodes at the locations of the cylinder
void cylinderSetup( BlockLatticeBase2D<T,DESCRIPTOR>& lattice,
IncomprFlowParam<T> const& parameters,
OnLatticeBoundaryCondition2D<T,DESCRIPTOR>& boundaryCondition )
{
const plint nx = parameters.getNx();
const plint ny = parameters.getNy();
Box2D outlet(nx-1,nx-1, 1, ny-2);
// Create Velocity boundary conditions everywhere
boundaryCondition.setVelocityConditionOnBlockBoundaries (
lattice, Box2D(0, 0, 1, ny-2) );
boundaryCondition.setVelocityConditionOnBlockBoundaries (
lattice, Box2D(0, nx-1, 0, 0) );
boundaryCondition.setVelocityConditionOnBlockBoundaries (
lattice, Box2D(0, nx-1, ny-1, ny-1) );
// .. except on right boundary, where we prefer an outflow condition
// (zero velocity-gradient).
boundaryCondition.setVelocityConditionOnBlockBoundaries (
lattice, Box2D(nx-1, nx-1, 1, ny-2), boundary::outflow );
setBoundaryVelocity (
lattice, lattice.getBoundingBox(),
PoiseuilleVelocity<T>(parameters) );
setBoundaryDensity (
lattice, outlet,
ConstantDensity<T>(1.) );
initializeAtEquilibrium (
lattice, lattice.getBoundingBox(),
PoiseuilleVelocityAndDensity<T>(parameters) );
plint cx = nx/4;
plint cy = ny/2+2; // cy is slightly offset to avoid full symmetry,
// and to get a Von Karman Vortex street.
plint radius = cy/4;
defineDynamics(lattice, lattice.getBoundingBox(),
new CylinderShapeDomain2D<T>(cx,cy,radius),
new plb::BounceBack<T,DESCRIPTOR>);
lattice.initialize();
}
