Turbulence over drag-reducing, anisotropically permeable substrates

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• Dr. Ricardo Garcia-Mayoral, University of Cambridge
• Friday 28 February 2020, 13:00-14:00
• LR5, Baker Building, CUED..

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 Fluids Group Seminar (CUED) series.

This talk is included in these lists:

• Acoustics Lab Seminars
• Engineering Department Acoustics/Combustion Student seminars
• Fluids Group Seminar (CUED)
• LR5, Baker Building, CUED.
• Venue to be confirmed

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