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<CENTER>Séminaire de Stephan Llewellyn Smith </CENTER>

3 octobre 2011

Hollow Vortices

13 octobre 16h
Salle Castex RDC

Pr. Stephan Llewellyn Smith, University of California at San Diego.

Résumé :
Hollow vortices are vortices whose interior is at rest. They posses vortex sheets on their boundaries and can be viewed as a desingularization of point vortices. We give a brief history of point vortices. We then obtain exact solutions for hollow vortices in linear and nonlinear strain and examine the properties of streets of hollow vortices. The former can be viewed as a canonical example of a hollow vortex in an arbitrary flow, and its stability properties depend. In the latter case, we reexamine the hollow vortex street of Baker, Saffman and Sheffield and examine its stability to arbitrary disturbances, and then investigate the double hollow vortex street. Implications and extensions of this work are discussed.