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題名 | 以離散渦流法模擬單一向後突張流暢=Numerical Simulation of a Single Downward Facing Step by the Discrete-Vortex Method |
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作者 | 莊書豪; 陳友正; Chuang, Shu-hao; Chen, Yu-cheng; |
期刊 | 機械技師學刊 |
出版日期 | 20141100 |
卷期 | 7:3 2014.11[民103.11] |
頁次 | 頁23-29 |
分類號 | 440.137 |
語文 | chi |
關鍵詞 | 離散渦流法; 向後突張; 數值模擬; 庫塔條件; Discrete vortex method; Downward facing step; Numerical simulation; Kutta condition; |
中文摘要 | 本文以離散渦流法(Discrete-vortex method)模擬單一向後突張流場,並計算探討在紊流層中擾動量的輸送現象。離散渦流法已成功的運用在流體流過單一圓柱體與一個垂直平板上。木文主要研究的目的乃擴展離散渦流法來摸擬單一向後突張的流場。主要的技術乃在剪力層上,從近後突張面的一些點(剪力層的厚度),依一個近似的時間間隔導入離散渦流於流場中。本文所得的計算結果與實驗或傳統現象論比較,發現除了近後突張面外整個流場物理趨勢還算合理。由此印證了離散渦流法的簡單與可行性。 |
英文摘要 | The study of this paper is that the discrete-vortex method simulates the separated flow in a single downward-facing step, and calculates the timedependent instantaneous local momentum fluctuation. The discrete-vortex simula-tion of some turbulent flows has been demonstrated as a powerful technique in modeling the flow over a bluff bodies at high Reynolds number, such as flow over a single cylinder and over two successive cylinders, flow over an inclined plate. The major objective of this paper is to extent the discrete vortex method simulation the separated flow in a single downward-facing step. The main technique is that the shear layers emanating from the edges of the downward-facing are represented by an array of discrete vortexes introduced into the flow field at appropriate time intervals at some fixed points near the edges of downward-facing. The strength of the nascent vortices are chosen so as to satisfy the Kutta condition at the edges of the downward-facing. From the comparison between calculative result of the study and experiment or traditional transport phenomenon, we can find that except near downward-facing, the physical tendency of flow field is reasonable. Therefore discrete-vortex method to prove for solution of a single downward facing step problem. |
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