Simulation of a 2D channel flow around a square obstacle with lattice-Boltzmann (BGK) automata

Results for time-dependent, viscous, incompressible flows were investigated using the lattice-Boltamann (BGK) automata. The decay of a synthetic turbu lent flow field and the time evolution of an initial vortex were simulated for validation purposes. The focal point was the investigation of the insta tionary flow around a square obstable in a two-dimensional channel for a ra nge of Reynolds numbers between 80 and 300 and a blockage ratio of 0.125. T he Strouhal number was measured for this case and found to be in the range of data given in the literature.