Documentation of the role of large-scale structures in the bursting process in turbulent boundary layers
2015 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 27, no 10Article in journal (Refereed) PublishedText
The scaling of the bursting frequency with Reynolds number is investigated experimentally by means of hot-wire measurements in turbulent boundary layers over the range 1580 < ReΘ < 23 700. Bursting events are detected by means of the u-level technique, and the effect of filtering and the choice of the threshold are also assessed. We find that the inner scaling produces excellent collapse of the high-pass filtered data in the buffer and log regions, regardless of the cutofffrequency and the threshold. This is due to the fact that the high-pass filter 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 filtered with very low cutofffrequencies, highlighting the connection between bursting phenomena and the outer flow.
Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2015. Vol. 27, no 10
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-181989DOI: 10.1063/1.4934625ISI: 000364402600028ScopusID: 2-s2.0-84946020562OAI: oai:DiVA.org:kth-181989DiVA: diva2:902545
QC 201602112016-02-112016-02-112016-02-11Bibliographically approved