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題名 | 軸對稱突擴流場之混沌特徵現象與數值模擬分析=Chaotic Character Phenomenon and Numerical Analysis of Axisymmetric Sudden Expansion Flow |
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作者 | 江俊顯; 劉彥宏; | 書刊名 | 修平學報 |
卷期 | 8 2004.03[民93.03] |
頁次 | 頁285-302 |
分類號 | 440.137 |
關鍵詞 | 突擴; 混沌; 紊流模式; 極限環; Turbulence model; Sudden expansion; Limit cycle; Chaotic; |
語文 | 中文(Chinese) |
中文摘要 | 本文使用k-ε及RNG兩種紊流模式對突擴流場的準確性與適用性做一比較,並探討其原因,經數值計算比較的結果得知RNG紊流模式預測速度分佈的能力比k-ε佳。而影響流場數值預測模擬之另一重要參數為入口條件,使用實驗值所求的入口條件無論在有渦漩及無渦漩的條件下均擁有較佳的速度預測能力。此外,本文亦在入口條件為u(t)=0.6+0.6sin (50t)時,尋找並討論軸對稱突擴流場在該條件下所產生極限環(Limit Cycle)的流動系統運動行為。從所得到相圖我們可以得知軸對稱突擴流場在特定週期入口條件下,系統流動行為兼具有紊流及混沌特徵現象。 |
英文摘要 | In this study, the standard k-ε turbulence model and the modified RNG-method-derived k-ε turbulence model were employed in an axisymmetric sudden expansion flow with or without swirling effect. A comparison of the velocity profiles was made with these turbulence models. From the calculating results, the performance of RNG model is better and in agreement with experiment than that of k-ε model. Furthermore, we innovatively utilized periodical inlet conditions to simulate the sudden expansion flow. Surprisingly, striking features of limit cycles of chaos were depicted in the phase diagrams. Thus, we could have an idea that the intermittent sudden expansion flow is both turbulent and chaotic character for the fluid/system dynamics. In brief, the RNG turbulent model could characterize the flow-field energy cascade and dissipation processes more accurately and efficiently. |
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