Abstract

We study small-scale and high-frequency turbulent fluctuations in three-dimensional flows under Fourier-mode reduction. The Navier-Stokes equations are evolved on a restricted set of modes,obtained as a projection on a fractal or homogeneous Fourier set. We find a strong sensitivity (reduction) of the high-frequency variability of the Lagrangian velocity fluctuations on the degree ofmode decimation, similarly to what is already reported for Eulerian statistics. This is quantified by atendency towards a quasi-Gaussian statistics, i.e., to a reduction of intermittency, at all scales andfrequencies. This can be attributed to a strong depletion of vortex filaments and of the vortex stretching mechanism. Nevertheless, we found that Eulerian and Lagrangian ensembles are stillconnected by a dimensional bridge-relation which is independent of the degree of Fourier-mode decimation.

Autore Pugliese

• Lanotte Alessandra Sabina

Tutti gli autori

• M. Buzzicotti ; A. Bhatnagar ; L. Biferale ; A.S. Lanotte ; S.S. Ray

Titolo volume/Rivista

New journal of physics

Anno di pubblicazione

2016

ISSN

1367-2630

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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