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Titolo:
EXPERIMENTAL INVESTIGATION OF TURBULENCE NEAR A LARGE-SCALE VORTEX
Autore:
ANDREOTTI B; MAURER J; COUDER Y; DOUADY S;
Indirizzi:
CNRS,ECOLE NORMALE SUPER,LAB PHYS STAT,24 RUE LHOMOND F-75231 PARIS 05 FRANCE CNRS,ECOLE NORMALE SUPER,LAB PHYS STAT F-75231 PARIS 05 FRANCE UNIV PARIS 06,ECOLE NORMALE SUPER,LAB PHYS STAT F-75231 PARIS 05 FRANCE UNIV PARIS 07,ECOLE NORMALE SUPER,LAB PHYS STAT F-75231 PARIS 05 FRANCE
Titolo Testata:
European journal of mechanics. B, Fluids
fascicolo: 4, volume: 17, anno: 1998,
pagine: 451 - 470
SICI:
0997-7546(1998)17:4<451:EIOTNA>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
FULLY-DEVELOPED TURBULENCE; EXTENDED SELF-SIMILARITY; REYNOLDS-NUMBER; FLOW; STATISTICS; DISKS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
B. Andreotti et al., "EXPERIMENTAL INVESTIGATION OF TURBULENCE NEAR A LARGE-SCALE VORTEX", European journal of mechanics. B, Fluids, 17(4), 1998, pp. 451-470

Abstract

The influence of a strong large scale vortex on neighbouring turbulence is investigated. For this purpose the statistical properties of thetangential velocity fluctuations are systematically investigated as afunction of the distance to the vortex core. Far from the vortex, thecharacteristics usually found in isotropic homogeneous turbulence areapproximately obtained. In the central region of the vortex a strong decrease of the amplitude of the velocity fluctuations and of the dissipation is observed. However in this region of space the Bow is not smooth: the energy spectrum E(k) still exhibits the equivalent of an inertial range bur with a slope which can range from k(-1.25) to k(-1) instead of the classical k(-5/3). Furthermore the intermittency is much weaker inside the vortex central region: the velocity differences PDFsno longer exhibit long stretched tails and are more self-similar fromscale to scale. In between these two regions, at the periphery of thevortex, the intermittency is strongly increased. It is shown that this increase is due to the mixing in the velocity signal of the two types of statistics (the strongly fluctuating bulk turbulence and the weakly fluctuating vortex flow). This situation is analysed using a variant of extended self similarity that we call LSS (loose self similarity)which lends itself to the analysis of situations where a clear scaling is not obvious. (C) Elsevier, Paris.

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Documento generato il 29/11/20 alle ore 15:10:51