| Autor: |
Jens Neumann, Hans Wengle |
| Rok vydání: |
2004 |
| Předmět: |
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| Zdroj: |
Journal of Turbulence. 5 |
| ISSN: |
1468-5248 |
| DOI: |
10.1088/1468-5248/5/1/022 |
| Popis: |
The influence of a passive (no external energy input) and an active (via energy input) forcing method on the coherent structures in different separated and reattaching flows is investigated. A (passive) surface-mounted fence and an (actively) oscillating-blowing/suction jet are utilized for the open-loop flow control. To cover a geometry-induced as well as a pressure-gradient-induced separation type, a turbulent (sharp-edged) backward-facing step flow and a turbulent flow with (a freely evolving) separation along a smoothly contoured convex surface are selected. The dynamics of the most energetic (coherent) structures and their impact on the mean flow characteristics are analysed based on results from large-eddy simulations. This analysis is realized by tracing the development of the coherent structures from the oncoming turbulent boundary layer to the separated and reattaching part of the shear layer and further downstream to the redeveloping turbulent boundary layer. Concerning the flow control, it is f... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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