頁籤選單縮合
題名 | Influence of Cell Size on DSMC Modeling of Rayleigh-Bénard Convection of a Rarefied Gas |
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作者 | Tzeng, Pei-yuan; Liu, Ming-ho; Chen, Ping-hsuang; Soong, Chyi-yeou; | 書刊名 | Journal of Aeronautics, Astronautics and Aviation. Series A |
卷期 | 38:2 民95.06 |
頁次 | 頁89-96 |
分類號 | 447.55 |
關鍵詞 | Rayleigh-bénard convection; Rarefied gas; DSMC; Effects of cell size; |
語文 | 英文(English) |
英文摘要 | The present work is a study of the flow patterns in a two-dimensional Rayleigh-BC)nard convection of a rarefied gas using the direct simulation Monte Carlo (DSMC) method with the emphasis on the influence of the cell size chosen in the simulation. An enclosure of length-to-height aspect ratio of AS=4 is taken as the physical model. Three different sampling cells 81C 21, 121C 31, and 161C 41 are considered. The computations are carried out at the Rayleigh numbers Ra=3000, 5000, 7000 and 9000 but with the Knudsen number fixed as a constant, Kn=0.01. The four- and five-roll structures can be observed for various numbers of sampling cells at a same Ra. The results reveal that the convective flow patterns obtained by the DSMC simulation with 81C 21 sampling cells, in which the collision cell size is just less than a mean free path, are most stable. |
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