Vortex Statistics from Vorticity Local Properties

Abstract eng:
Systematic procedures for the identification of vortices/coherent structures have been proposed as a way to address their kinematical and dynamical roles in structural formulations of turbulence. We investigate how the known vortex identification criteria performs in controled numerical experiments, and pinpoint a number of relevant difficulties. These issues are addressed – and essentially solved – from the introduction of an alternative vortex identification criterion which is entirely based on local properties of the vorticity field.

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