| Autor: |
Yuta KAWAI, Yoshiyuki TSUJI, Yutaka KUKITA |
| Jazyk: |
angličtina |
| Rok vydání: |
2007 |
| Předmět: |
|
| Zdroj: |
Journal of Fluid Science and Technology, Vol 2, Iss 3, Pp 665-678 (2007) |
| Druh dokumentu: |
article |
| ISSN: |
1880-5558 |
| DOI: |
10.1299/jfst.2.665 |
| Popis: |
Coherent vortical structures in a high-Reynolds number turbulent jet indicating edgetone oscillations are extracted from velocity and pressure data. Three statistical quantities are adopted as the candidate indicators of coherent structures; (i) phase-averaged vorticity, (ii) phase-averaged pressure, and (iii) phase-averaged velocity gradient tensor. All these quantities work well for extracting coherent structures in a test case of low-Reynolds number cylinder wake. However, when applied to the high-Reynolds number edgetone flow, (ii) and (iii) indicate much better performance than (i), because (i) is affected by the background time-averaged vorticity field. The advection speed of coherent structures is evaluated and compared with Powell's feedback mechanism. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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