Vortex stripping and the generation of high vorticity gradients in two-dimensional flows |
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| Authors: | B. Legras and D. Dritschel |
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| Affiliation: | (1) Laboratoire de Météorologie Dynamique du CNRS, École Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05;(2) Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, CB3 9EW Cambridge |
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| Abstract: | We study the stripping of vortices with monotonic vorticity profiles within adverse shear. It is shown that distributed vortices behave differently from uniform patches regarding the critical onset of tearing. Stripping erodes the exterior layers of a distributed profile and generates very high vorticity gradients at the edge of the vortex. These effects are measured, and a theory which allows a detailed quantification of the mechanism is presented. |
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| Keywords: | vortex dynamics coherent structures two-dimensional turbulence |
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