Dynamic Multiscaling in Two-Dimensional Fluid Turbulence

Ray, Samriddhi Sankar and Mitra, Dhrubaditya and Perlekar, Prasad and Pandit, Rahul (2011) Dynamic Multiscaling in Two-Dimensional Fluid Turbulence. In: Physical Review Letters, 107 (18).

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Abstract

We obtain, by extensive direct numerical simulations, time-dependent and equal-time structure functions for the vorticity, in both quasi-Lagrangian and Eulerian frames, for the direct-cascade regime in two-dimensional fluid turbulence with air-drag-induced friction. We show that different ways of extracting time scales from these time-dependent structure functions lead to different dynamic-multiscaling exponents, which are related to equal-time multiscaling exponents by different classes of bridge relations; for a representative value of the friction we verify that, given our error bars, these bridge relations hold.

Item Type:	Journal Article
Publication:	Physical Review Letters
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	21 Dec 2011 09:55
Last Modified:	21 Dec 2011 09:55
URI:	http://eprints.iisc.ac.in/id/eprint/42623

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