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Artikel
Documentation of the role of large-scale structures in the bursting process in
turbulent boundary layers
| Författare: |
Vinuesa, R., Hites, M. H., Wark, C., Nagib, H.M. |
| Dokumenttyp: |
Artikel |
| Tillstånd: |
Publicerad |
| Tidskrift: |
Physics of Fluids |
| Volym: |
27
105107 |
| År: |
2015 |
AbstractThe scaling of the bursting frequency with Reynolds number is investigated experimentally by means of hot-wire measurements in turbulent boundary layers over the range 1; 580 < Re < 23; 700. Bursting events are detected by means of the u-level technique, and the eect of ltering and the choice of the threshold are also assessed. We nd that the inner scaling produces excellent collapse of the high-pass ltered data in the buer and log regions, regardless of the cut-o frequency and the threshold. This is due to the fact that the high-pass lter attenuates the low frequency component of the streamwise velocity signal, which is associated with large-scale structures in the flow. On the other hand, the bursting frequency scales with outer variables when the time-series is low-pass ltered with very low cut-o frequencies, highlighting the connection between bursting phenomena and the outer flow.
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