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| 題 名 | 非線性K-□模式於平板混合紊流場之研究=Numerical Studies of the Turbulent Planar Mixing Layer Using Nonlinear k-□ Model |
|---|---|
| 作 者 | 張克勤; 徐子圭; 郭益彰; | 書刊名 | 航空太空及民航學刊. 系列B |
| 卷 期 | 43:1 2011.04[民100.04] |
| 頁 次 | 頁43-54 |
| 分類號 | 447.55 |
| 關鍵詞 | 混合紊流; 雷諾應力; 紊流模式; 非線性渦流黏滯係數模式; Mixing layer; Reynolds stresses; Turbulent model; Nonlinear eddy-viscosity formulation; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 平板混合流係高/低速兩股流體於端板後方之混合現象(two phase mixing layer flow),而混合流之下游產之流場現象,於發展到自我保持區域的紊流狀態過程,以DNS(Direct Numerical Simulation)或LES(Large-Eddy Simulation)求解,所需計算資源非常龐大,而以雙方程式紊流模式爲一般常用之模擬方法,但平板混合流場存在非等向性的渦流黏滯係數問題,迄今未有有效方法精確模擬。本研究嘗試使用非線性渦流黏滯係數模式來取代Boussinesq假說計算之的雷諾應力,以RANS方程式來模擬平板混合紊流場高低速測速度比r=0.62及r=0.39的流場從紊流狀態發展到自我保持區域的過程;同時比對standard k-ε、Abe(2003)、GS(1993)及Rahman(2006)的顯式代數雷諾應力模式之差異,並將這些結果與實驗數據作比較。研究結果顯示使用非線性渦流黏滯係數模式可以得到比Boussinesq假說更爲準確的雷諾應力。 |
| 英文摘要 | The two phase mixing layer flow that forms between two fluid streams moving with different velocities. In order to simulate the downstream flowfield from the developing to self-preserved regions of the turbulent planar mixing layer, it cost lot of computational resource using DNS (Direct Numerical Simulation) or LES (Large-Eddy Simulation) method to solve. In generally, the two-equation turbulent model is usually, but the flowfiled remains the non-isotropic eddy-viscosity problem. There is no an art-of-state numerical method accuracy to simulate in recently. Hence to solve this problem using RANS method we rely on turbulence modeling techniques, in which the nonlinear eddy-viscosity formulation perform on the predictions of the Reynolds stresses to replace the model associated with the Boussinesq hypothesis. Two cases with inflow-speed-radio r=0.62 and 0.39 were testing. From RANS turbulence models, including the standard k-ε model which is under the Boussinesq hypothesis, the explicit algebraic stress model of GS (1993), the nonlinear eddy-viscosity model of Abe (2003), and the low Reynolds number explicit algebraic stress model of Rahman (2006), are tested and their predictions of flow properties are compared with the measurement data. It shows that nonlinear eddy-viscosity model can achieve accurate quantitative simulation as well as a reasonable Reynolds stresses of the mixing layer. |
本系統中英文摘要資訊取自各篇刊載內容。