Point-Vortex Simulations Reveal Universality Class in Growth of 2D Turbulent Mixing Layers

Details Point-Vortex Simulations Reveal Universality Class in Growth of 2D Turbulent Mixing Layers Point-Vortex Simulations Reveal Universality Class in Growth of 2D Turbulent Mixing Layers

2010-08-17

arxiv.org/abs/1008.2876v1

Physics

Fluid Dynamics

5 pages, 4 figures

Scientific paper

A central but controversial issue in free turbulent shear flows has been the universality (or otherwise) of their growth rates. We resolve this issue here in the special case of a temporal 2D mixing layer in a point vortex gas by extensive high-precision numerical simulations, utilizing for the first time a powerful ensemble-averaging strategy. The simulations show that the momentum thickness of such a mixing layer grows at the universal asymptotic rate of 0.0167 +/- 0.00017 times the velocity differential across the layer over a wide range of initial conditions, often after very long transients.

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