Self-adaptation and viscous selection in concentrated two-dimensional vortex dipolesReportar como inadecuado




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* Corresponding author 1 Meudon - ONERA - The French Aerospace Lab 2 LadHyX - Laboratoire d-hydrodynamique

Abstract : In this Letter we deal with 2D direct numerical simulations of concentrated vortex dipoles. We show that various initial dipolar vorticity distributions evolve towards a specific family of dipoles parametrized by the dipole aspect ratio a-b, where a is the radius of the vortices based on the vorticity polar moment in half a plane and b is the separation between the vortex centroids. This convergence is achieved through viscous effects. The considered Reynolds numbers Re= G-v are Re= 3000 and Re= 15000. Moreover, all the dipoles of this family are quasi-steady solutions of the Euler equations. Their scatter plots and drift velocities are given for a-b



Autor: D. Sipp - L. Jacquin - Carlo Cosssu -

Fuente: https://hal.archives-ouvertes.fr/



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