Lattice-BGK simulation of a two-dimensional channel flow around a square cylinder

The confined flow around a square cylinder mounted inside a two-dimensional channel (blockage ratio \beta=1/8) was investigated in detail by a newly developed incompressible nonuniform lattice-BGK model. It is found that the vortex shedding behind the cylinder induces periodicity in the flow field, and the periodicity of the flow will lose for Re>300. A detailed analysis for a range of Reynolds numbers between 1 and 500 was presented. Quantitative comparisons with other methods show that the model gives accurate results for complex flows.