Identification

Title

Isotropization at small scales of rotating helically driven turbulence

Abstract

We present numerical evidence of how three-dimensionalization occurs at small scale in rotating turbulence with Beltrami (ABC) forcing, creating helical flow. The Zeman scale lΩ at which the inertial and eddy turn-over times are equal is more than one order of magnitude larger than the dissipation scale, with the relevant domains (large-scale inverse cascade of energy, dual regime in the direct cascade of energy E and helicity H, and dissipation) each moderately resolved. These results stem from the analysis of a large direct numerical simulation on a grid of 3072³ points, with Rossby and Reynolds numbers, respectively, equal to 0.07 and 2.7 x 10⁴. At scales smaller than the forcing, a helical wave-modulated inertial law for the energy and helicity spectra is followed beyond lΩ ; by Kolmogorov spectra for E and H. Looking at the two-dimensional slow manifold, we also show that the helicity spectrum breaks down at lΩ ;, a clear sign of recovery of three-dimensionality in the small scales.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7c53mhk

codeSpace

Dataset language

eng

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Classification of spatial data and services

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geoscientificInformation

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keyword value

Text

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title

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reference date

date type

publication

effective date

2016-01-01T00:00:00Z

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date type

publication

effective date

2012-05-01T00:00:00Z

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None

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Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

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