Abstract
Entropic lattice Bolzmann model (ELBM) is known as the method enhancing stability by satisfying the second principle of the thermodynamic by imposing the monotonicity and the minimality of the H-function. But the validities of the results, especially for unsteady flow, were not comfirmed sufficiently. In our previous study, we applied ELBM to a 2-dimensional channel flow past single square cylinder, and found that the validity of ELBM is guaranteed under the condition of rms value of viscosity difference ratio Δ_<0rms> Δ_<0rms>≤0.24. But the generality of the condition have not been confirmed. In this study, we applied ELBM to a 2-dimensional channel flow past two square cylinders arranged side by side in Reynolds number region Re = 100 and 1000 and investigated the effect of number of cylinder on the validity condition. As a results, it was found that as well as the in the case of single square cylinder, the condition Δ_<0rms>≤0.24 is also almost reasonable in the case of two square cylinder.
