Secondary shear instabilities on Kelvin-Helmholtz braids

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• Emma Bouckley (University of Cambridge)
• Wednesday 08 October 2025, 13:00-14:00
• MR12.

If you have a question about this talk, please contact Emma.

I will be talking about my summer research project from the Woods Hole GFD programme.

KH instabilities are widespread in nature and a dominant form of stratified shear instability. The primary billow is well understood, with the classical Miles–Howard stability condition, Ri>1/4. In this talk, we are interested in the secondary instabilities that arise as the primary billow develops. The occurrence and precise nature of these secondary instabilities is crucial for understanding the transition to turbulence and mixing. In particular, we focus on secondary shear instabilities that form on the braid, motivated by estuarine observations. We investigate these using 2D DNS and compare the results with a reduced inviscid model.

This is an informal lunchtime seminar, please bring along your lunch.

This talk is part of the Institute of Theoretical Geophysics lunchtime seminar series.

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