Selective opposition-like control of large-scale structures in wall-bounded turbulence
Authors
Ibrahim, JI
Guseva, A
Garcia-Mayoral, R
Publication Date
2020-04-01Journal Title
Journal of Physics: Conference Series
ISSN
1742-6588
Publisher
IOP Publishing
Volume
1522
Issue
1
Language
en
Type
Article
This Version
VoR
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Ibrahim, J., Guseva, A., & Garcia-Mayoral, R. (2020). Selective opposition-like control of large-scale structures in wall-bounded turbulence. Journal of Physics: Conference Series, 1522 (1) https://doi.org/10.1088/1742-6596/1522/1/012015
Abstract
<jats:title>Abstract</jats:title>
<jats:p>We investigate the effect of controlling large-scale, logarithmic-layer turbulent structures, which have a characteristic size and aspect ratio that scale with the distance from the wall. The aim is to quantify the effect of suppressing these structures while leaving the near-wall turbulent dynamics unaltered. By affecting only the logarithmic-layer structures, it might be possible to isolate their contribution to the drag from that of the other scales in the flow. We conduct direct numerical simulations of turbulent channel flows at friction Reynolds number <jats:italic>Re<jats:sub>T</jats:sub>
</jats:italic> ?s 500-1000 and artificially remove certain streamwise and spanwise wavelengths of the wall-normal velocity across a range of heights. The wavelengths chosen depend on the target height (and size) of the structures that we wish to target. When these wavelengths are removed, we observe a positive, outward shift of the mean velocity profile above the target height, due to a local reduction in Reynolds shear stress, and a subsequent increase in viscous stress. Our preliminary results suggest that this shift in the mean velocity profile scales in outer units.</jats:p>
Keywords
Paper
Identifiers
jpcs_1522_1_012015, j15221015
External DOI: https://doi.org/10.1088/1742-6596/1522/1/012015
This record's URL: https://www.repository.cam.ac.uk/handle/1810/333685
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Licence:
http://creativecommons.org/licenses/by/3.0/
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