頁籤選單縮合
題 名 | Numerical Simulation and Stability Analysis of Laminar Wake Behind a Circular Cylinder |
---|---|
作 者 | Huang,Mei-jiau; | 書刊名 | The Chinese Journal of Mechanics |
卷 期 | 14:4 1998.12[民87.12] |
頁 次 | 頁183-192 |
分類號 | 440.13 |
關鍵詞 | Vortex shedding; Frequency selection; Orr-sommerfeld; Absolute instability; Convective instability; |
語 文 | 英文(English) |
英文摘要 | The transition of a viscous incompressible laminar flow behind a circular cylinder from a steady state to its wake counterpart at Reynolds number Re=100, based on the free stream velocity (U) and the cylinder diameter (D), is directly simulated. The two-dimensional unsteady Navier-Stokes equations are solved numerically by taking advantage of the splitting technique and the spectral element method. The main goal of this work is to explore the frequency- selection mechanism of the wake through the use of the absolute/convective instability theory, which in turn is performed by investigating the one-dimensional Orr-Sommerfeld equation. It is found that the predicted onset frequency based on the maximum-growth criterion is in a good agreement with the numerically observed one, although the measured growth rate is found smaller. The saturated frequencies predicted by the maximum-growth criterion and Kock's transition criterion are the same and also close to the measured one. More simulation or experimental data are needed for a further conclusion however. |
本系統中英文摘要資訊取自各篇刊載內容。