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題名 | k-ε紊流模式之近壁行為探討=On the Study of Near Wall Behavior of k-ε Turbulence Models |
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作者姓名(中文) | 趙勝裕; 黃榮鑑; | 書刊名 | 力學 |
卷期 | 13:3 1997.09[民86.09] |
頁次 | 頁265-275 |
分類號 | 332.76 |
關鍵詞 | k-ε紊流模式; 低雷諾數模式; 雷諾應力模式; k-ε turbulence model; Low reynolds number model; Reynolds stress model; |
語文 | 中文(Chinese) |
中文摘要 | 文中選用Chien, Lam and Bremhorst, Shima與 Lai and So四種近壁紊流模式, 解析有直接數值模擬結果可供參考之二維渠流,以詳細評比紊流模式飲近壁特性。由此比較 ,一方面可得知紊流模式之進展過程與所獲致成果,及現存模式之缺失,亦可據此選用較佳 之紊流模式以供日後應用,或作為改良模式之依據。文中發現,模式合成結果遠優於單項模 式值之分佈,因單項模式誤差值可互相抵消。但對於複雜之紊流場,此種誤差值互相抵消之 特性可能不復存在。為求選用之模式能有較廣之適用範圍與較佳之模式結果,應選擇模式合 成結果與單項模式值分佈均佳者,如 Lam and Bremhorst 與 Lai and So 的模式即是。 |
英文摘要 | Low Reynolds number model of Chien,Lam and Bremhorst, and Reynolds stress model of Shima, Lai and So are selected to calculate a two-dimensional turbulent channel flow that has direct numerical simulation results available. Comparison of model results with DNS data is made in the present study to evaluate the performance of each modeling term. It is found that large discrepan-cies exist between the DNS budgets and the modeled production and destruction terms of the ε equation. For simple channel flow the discrepancies are similar in magnitude but opposite in sign, so they are canceled by each other. However, such a discrepancy cancelation may not be true for complex turbulent flows. Thus, to ensure a wider and better predictability, it is better to select a turbulence model that has an overall and indi-vidual modeling consistency with the DNS budgets, such as the LB and LS model. |
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