| A PDF Description of Momentum Fluctuation Correlations of a Rarefied Free Shear Layer | |
|---|---|
| 學年 | 94 |
| 學期 | 2 |
| 出版（發表）日期 | 2006-06-01 |
| 作品名稱 | A PDF Description of Momentum Fluctuation Correlations of a Rarefied Free Shear Layer |
| 作品名稱（其他語言） | |
| 著者 | Hong, Zuu-chang; Zhen, C. E.; Yang, C. Y. |
| 單位 | 淡江大學機械與機電工程學系 |
| 出版者 | 臺北市：中華民國力學學會 |
| 著錄名稱、卷期、頁數 | Journal of Mechanics 22(2), pp.85-92 |
| 摘要 | The mixing properties of various orders of fluctuation correlations are investigated in the present paper for a rarefied gas free shear layer at hypersonic speed. The molecular kinetic theory and the direct simulation Monte Carlo (DSMC) method are employed for the present calculations. The Reynolds average process is assumed in obtaining the correlation functions. The results show that flow field structure was very similar to that of continuum flow ones at high Reynolds numbers. The probability density functions (pdf) in velocity space f(u′),f(v′), and f(u′, v′) are also calculated to counter explain the distributions of the correlation functions in the mixing layer. From the calculated distributions of the fluctuation correlation functions, <u′v′>, <u′2 v′>, and <v′2 u′>, one can find that the distributions behave similar to the turbulent transport phenomena in that of a continuum flow one. The distributions of the fluctuation correlation functions, <u′, v′> is described via the joint probability density function, f(u′, v′). The behavior of the higher-order fluctuation correlation functions, <u′2 v′>, <u′3> and <u′4 >, are also explained via the probability density function. |
| 關鍵字 | DSMC;Free shear layer;PDF;Fluctuation correlation function |
| 語言 | en |
| ISSN | 1727-7191 |
| 期刊性質 | 國內 |
| 收錄於 | |
| 產學合作 | |
| 通訊作者 | |
| 審稿制度 | |
| 國別 | TWN |
| 公開徵稿 | |
| 出版型式 | 紙本 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/45680 ) |
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