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Turbulence over drag-reducing, anisotropically permeable substrates

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If you have a question about this talk, please contact Connor O'Pray.

This talk will mainly review the PhD thesis of Garazi Gómez-de-Segura on anisotropic permeable substrates. Similar to riblets, these substrates are conceived to produce a change in drag through two competing mechanisms. The first, which is drag-reducing, consists in imposing different apparent origins to the mean flow and the turbulent fluctuations. The second, which is drag increasing, consists in the excitation of a Kelvin-Helmholtz-like instability just above the substrate. We will present results from direct simulations, which show that these surfaces can substantially outperform riblets, while exhibiting the same drag-altering mechanisms, by exploiting them more optimally. We will also present low-order models, obtained from linear analysis, which predict accurately the performance of these substrates.

This talk is part of the Fluid Mechanics (CUED) series.

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