Point-Vortex Simulations Reveal Universality Class in Growth of 2D Turbulent Mixing Layers
Fluid Dynamics
2010-08-18 v1 Computational Physics
Abstract
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.
Keywords
Cite
@article{arxiv.1008.2876,
title = {Point-Vortex Simulations Reveal Universality Class in Growth of 2D Turbulent Mixing Layers},
author = {Saikishan Suryanarayanan and Roddam Narasimha},
journal= {arXiv preprint arXiv:1008.2876},
year = {2010}
}
Comments
5 pages, 4 figures