S0504-6-4 エントロピック格子ボルツマンモデルを用いた正法角柱周りの2次元チャネル流れの解析(噴流,後流および剥離流れの流動解析と応用(その6))

概要

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Entropic lattice Boltzmann method (ELBM) was developed in recent years. The method satisfies the second principle of the thermodynamic by imposing the monotonicity and the minimality of the H-function and overcomes disruptive non-linear instability occurring in the standard LBGK model. In this study, we applied ELBM to a 2-dimensional channel flow past a square cylinder in Reynolds number range Re ⪯ 1000, and calculated flow variables was compared with those calculated by other models. As a result, it was confirmed that ELBM can get stable solution using coarser grid than that used in standard LBGK model. The results of ELBM calculated by enough grid resolution to get stable solution in LBGK model simulation is consist with that obtained by LBGK model. Qualitative and quantitative validation of ELBM simulation can be evaluated by viscosity difference rate △_<0rms> and in this study, the reliable results can get under the condition △_<0rms> < 0.24.
社団法人日本機械学会の論文
2009-09-12