Mixing and vorticity staircases in 2-d fluid flows

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• Andrew Gilbert (University of Exeter)
• Monday 15 February 2010, 16:00-17:00
• MR14, DAMTP, Pav. F.

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

Vortices are important structures in many fluid flows, for example hurricanes and cyclones in the atmosphere, or gulf stream rings in the ocean. We have been studying some of the idealised behaviour of high Reynolds number vortices in two dimensions. These involve coupling between transport of vorticity as a scalar (in two dimensions) but one which also determines the flow field. These studies, which link the stability properties of vortices to their mixing properties throw light on questions of why vortices are so robust, how they can support structures such as tripoles and cat’s eyes, and the emergence of `surf zones’ of enhanced mixing and vorticity `staircases’. We will outline some of our research in this area (with Matthew Turner, Brighton, Andrew Bassom, Perth).

This talk is part of the DAMTP Astrophysics Seminars series.

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