頁籤選單縮合
題名 | Numerical Simulation and Stability Analysis of Laminar Wake Behind a Circular Cylinder= |
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作者 | Huang,Mei-jiau; |
期刊 | The Chinese Journal of Mechanics |
出版日期 | 19981200 |
卷期 | 14:4 1998.12[民87.12] |
頁次 | 頁183-192 |
分類號 | 440.13 |
語文 | eng |
關鍵詞 | Vortex shedding; Frequency selection; Orr-sommerfeld; Absolute instability; Convective instability; |
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. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。