Hot-wire spatial resolution issues in adverse pressure gradient turbulent boundary layers

Dróżdż A, Örlü R, Sokolenko V, Schlatter P, Elsner W, Niegodajew P (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Measurement Elsevier

Book Volume: 237

Article Number: 115229

DOI: 10.1016/j.measurement.2024.115229

Abstract

The effect of a finite length of hot-wire probe sensor length on the measured streamwise velocity fluctuations is well understood in canonical wall-bounded flow, where the small-scale energy has been found to be universal and invariant with Reynolds number. A straightforward application of that assumption to non-canonical flows such as strong adverse pressure gradient (APG) flows has, however, been hampered since the effect of Re and APG could not conclusively be studied separately due to the lack of data with a clear scale separation. The present experimental investigation at Reτ≈4000 in weak, moderate and strong APGs with different wire length shows that spatial averaging effects are not only limited to the inner layer. A note of caution is hence warranted for measurements that seemingly try to take the bias effect of spatial attenuation into account by performing measurements with albeit long but fixed viscous-scaled wire length.

Involved external institutions

Częstochowa University of Technology (CUT) / Politechnika Częstochowska

Poland (PL) Oslo Metropolitan University (OsloMet)

Norway (NO)

How to cite

APA:

Dróżdż, A., Örlü, R., Sokolenko, V., Schlatter, P., Elsner, W., & Niegodajew, P. (2024). Hot-wire spatial resolution issues in adverse pressure gradient turbulent boundary layers. Measurement, 237. https://doi.org/10.1016/j.measurement.2024.115229

MLA:

Dróżdż, Artur, et al. "Hot-wire spatial resolution issues in adverse pressure gradient turbulent boundary layers." Measurement 237 (2024).

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