https://scholars.lib.ntu.edu.tw/handle/123456789/411179
Title: | Numerical simulation and stability analysis of laminar wake behind a circular cylinder | Authors: | Huang Mei-Jiau | Issue Date: | 1998 | Publisher: | Soc Theor Appl Mech, Taipei, Taiwan | Journal Volume: | 14 | Journal Issue: | 4 | Start page/Pages: | 183-192 | Source: | Chinese Journal of Mechanics Series A (English Edition) | Abstract: | The transition of a viscous incompressible laminar flow behind a circular cylinder from a steady state to its wake counterpart at a 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. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032257182&partnerID=40&md5=60ed9e23dcece23490fa81cc854d956e https://scholars.lib.ntu.edu.tw/handle/123456789/411179 https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032257182&doi=10.1017%2fs1727719100000216&partnerID=40&md5=5166ba57173e4461888d78cb6d1c4282 |
ISSN: | 10174370 | SDG/Keyword: | Computer simulation; Cylinders (shapes); Incompressible flow; Natural frequencies; Navier Stokes equations; Reynolds number; Transition flow; Unsteady flow; Viscous flow; Vortex shedding; Wakes; Absolute/convective instability theory; Frequency selection; Orr-Sommerfeld equation; Laminar flow |
Appears in Collections: | 機械工程學系 |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.