J054021 モンテカルロ直接法を基にした低拡散粒子法の開発にむけて([J05402]マイクロ・ナノスケールの熱流体現象(2))

概要

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NS-DSMC hybrid methods are used for numerical analysis when flow fields continuously transit from high density to high vacuum. For example these flow fields appear on space planes, satellite thrusters, and jet orifices making semiconductors. However, the results of those methods didn't have high accuracy and computational efficiency, because it is difficult to connect continuum methods and particle methods. Therefore the LD-DSMC hybrid method based on the particle method is proposed by Burt et al. The results of this method have high accuracy and computational efficiency because it is easy to connect between the particle methods. In this study, in order to develop the LD-DSMC hybrid code, we need to understand more about numerical analysis around a 2D cylinder by using NS and DSMC method at first. Then we estimate Kn dependence of flow by comparing between NS and DSMC results. The results show that the present DSMC results fairly agree with the experimental results. Drag coefficient and friction drag contribution on the drag increase as Kn becomes large.
一般社団法人日本機械学会の論文
2011-09-11