Lift-induced vortex dipole collapse

Ravichandran, S and Dixit, Harish Nagaraj and Govindarajan, R (2017) Lift-induced vortex dipole collapse. Physical Review Fluids, 2 (034702). ISSN 2469-990X

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Abstract

Two vortices of opposite sign in two dimensions merely move along parallel lines. We show that even a small buoyancy completely changes this dynamics. When the vortices are of different density from their surroundings, buoyancy produces a lateral drift by Kutta lift. This causes the density patches to merge, and the vortex dipole to collapse. This is followed by a rapid upward (for light vortices) ejection and creation of small-scale structures by baroclinic torque. Our simple analytical equation explains the trajectory of the vortices. We show that these events occur in viscous simulations of many buoyant vortices.

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IITH Creators:	IITH Creators ORCiD Dixit, Harish Nagaraj UNSPECIFIED
Item Type:	Article
Subjects:	Physics > Mechanical and aerospace
Divisions:	Department of Physics
Depositing User:	Team Library
Date Deposited:	04 Apr 2017 10:30
Last Modified:	01 Sep 2017 11:08
URI:	http://raiithold.iith.ac.in/id/eprint/3131
Publisher URL:	https://doi.org/10.1103/PhysRevFluids.2.034702
OA policy:	http://www.sherpa.ac.uk/romeo/issn/2469-990X/
Related URLs:	Google Scholar

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