Abstract: A lattice Boltzmann model (LBM) with nonuniform mesh is proposed based on domain decomposition technique.The basic idea is to divide the flow domain into some regular subdomains,and then perform simulations on each subdomain using LBM with uniform mesh.The values on the boundaries of the subdomains are determined by interpolation.The 2-D flow around a cylinder is simulated using the model,the results are also compared with those of other methods.

Key words: lattice Boltzmann method, nonuniform mesh, domain decomposition