Scale interactions and non-local flux in hydrodynamic turbulence

AMS Citation:
Mininni, P. D., A. Alexakis, and A. G. Pouquet, 2008: Scale interactions and non-local flux in hydrodynamic turbulence. IUTAM Symposium on Computational Physics and New Perspectives in Turbulence, Y. Kaneda, Ed., IUTAM Bookseries, Springer, Dordrecht, 125-130 doi:10.1007/978-1-4020-6472-2_19.
Date:2008-02-13
Resource Type:chapter
Title:Scale interactions and non-local flux in hydrodynamic turbulence
Abstract: Direct numerical simulations of hydrodynamical turbulence are performed in the presence of a large-scale forcing up to Taylor-based Reynolds numbers of 800 for a Taylor-Green flow and 1000 for ABC forcing. Statistics on the triadic interactions responsible for the transfer of energy, and on their integrated counterparts are obtained from simulations with a turbulent steady state integrated for more than ten eddy turn-over times. The maximum resolution of the runs performed on regular grids are 10243 points. It is shown that the energy transfer is local but at the highest resolution as much as 20% of it comes from non-local interactions involving widely separated scales, with a particular emphasis on the forcing scale k0/-1. The scaling of the ratio of nonlocal to local energy flux with Reynolds number is found to be a power law.
Subject(s):High-Reynolds-number flows, Direct numerical simulations, Isotropic and homogenous turbulence
Peer Review:Refereed
Copyright Information:Copyright 2008 Springer.
OpenSky citable URL: ark:/85065/d7dj5hbz
Publisher's Version: 10.1007/978-1-4020-6472-2_19
Author(s):
  • Pablo Mininni - NCAR/UCAR
  • Alexandros Alexakis - NCAR/UCAR
  • Annick Pouquet - NCAR/UCAR
  • Editor(s):
  • Yukio Kaneda
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