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IUTAM Symposium on Elementary Vortices and Coherent Structures: Significance in Turbulence Dynamics

Part of the Fluid Mechanics and Its Applications Book Series (volume 79)

Editors: KIDA, SHIGEO

DOI: 10.1007/1-4020-4181-0

ISBN: 978-1-4020-4180-8

Publisher: Springer Netherlands - Springer Journals

Jan 1, 2006

1 - 10 of 40 Chapters

Available

CLUSTERING OF INTENSE STRUCTURES IN ISOTROPIC TURBULENCE: NUMERICAL AND EXPERIMENTAL EVIDENCE

Moisy, Frédéric; Jiménez, Javier

Pages: 3 –12

[The spatial distribution of intense structures in isotropic turbulence is studied from numerical and experimental data. Box-counting of the intense vorticity and strain rate sets gives evidence of a strong clustering at intermediate scales, from which a possible fractal dimension can be defined....
Available

MULTI MODES FOR THE VORTEX SHEET-TUBE TRANSFORMATION PROCESS AND VISCOELASTIC EFFECT

Horiuti, Kiyosi; Takagi, Yohei; Abe, Syouji

Pages: 13 –18

[A process for formation of the stretched spiral vortex was investigated using the DNS data of homogeneous turbulence. It was shown that vortex tube was generated not by a rolling up of single vortex sheet but through an interaction of dual sheets. Depending on the alignment of vorticity vectors...
Available

DYNAMICS OF SMALL-SCALE VORTICITY AND STRAIN-RATE STRUCTURES IN THE TRANSITION FROM ISOTROPIC TO SHEAR TURBULENCE

Brasseur, James G.; Lin, Winston

Pages: 19 –30

[Local topological and statistical measures of enstrophy and strain-rate structures are compared with global statistics to determine the effects of mean shear on the interactions between fluctuating vorticity and strain rate in DNS of transitioning isotropic to shear turbulence. “Structures” are...
Available

INTERACTION BETWEEN A COLUMNAR VORTEX AND EXTERNAL TURBULENCE

Takahashi, Naoya; Miyazaki, Takeshi

Pages: 31 –38

[The interaction between a columnar vortex and external turbulence is investigated numerically. As columnar vortices, the Lamb-Oseen vortex and the q-vortex are used. The columnar vortex is immersed in an initially isotropic homogeneous turbulence field, which itself is produced by a direct...
Available

VORTEX STRUCTURES IN A ROUGH-WALL CHANNEL FLOWAND THEIR INFLUENCE ON PASSIVE SCALAR

Orlandi, Paolo; Leonardi, Stefano; Antonia, Robert Anthony

Pages: 39 –49

[DNSs of turbulent channel flows with one rough wall and one smooth wall are presented to show how the vorticity field depends on the shape and orientation of the roughness elements. The passive scalar is also evaluated. The high correlation coefficients between vorticity and scalar gradients, in...
Available

THE NEAR-WALL STRUCTURES OF TURBULENT WALL FLOWS

Jiménez, Javier; Kawahara, Genta; Simens, Mark P.; del Álamo, Juan C.

Pages: 53 –70

[Models for the viscous and buffer layers over smooth walls are reviewed. It is shown that there is a family of numerically-exact nonlinear structures which account for about half of the energy production and dissipation in the wall layer. The other half can be modelled by the unsteady bursting...
Available

COHERENT FINE SCALE EDDIES IN THE LOGARITHMIC REGION OF TURBULENT CHANNEL FLOWS

Miyauchi, Toshio; Kang, Shin-Jeong; Tanahashi, Mamoru

Pages: 71 –80

[Coherent fine scale eddies (CFSEs) play an important role in generating streak structures and Reynolds shear stress not only in the near-wall region but also in the logarithmic region. The diameter and maximum azimuthal velocity of the CFSEs in the near-wall, logarithmic and wake regions can be...
Available

ON THE POSSIBLE EXISTENCE OF A CO-SUPPORTING CYCLE OF LARGE-SCALE AND NEAR-WALL STRUCTURES IN WALL TURBULENCE

Itano, Tomoaki; Toh, Sadayoshi

Pages: 81 –91

[Direct numerical simulation of a turbulent channel flow in a periodic domain of relatively wide spanwise extent, but minimal streamwise length, is carried out at Reynolds number Reτ = 349. The large-scale structures previously observed in studies of turbulent channel flow using huge...
Available

PERIODIC MOTION IN HIGH-SYMMETRIC FLOW

van Veen, Lennaert; Kida, Shigeo; Kawahara, Genta

Pages: 93 –103

[We investigate unstable periodic motion embedded in isotropic turbulence with high symmetry. Several orbits of different period are continued from the regime of weak turbulence into developed turbulence. The orbits of short period diverge from the turbulent state as the Reynolds number increases...
Available

VORTEX TUBES IN VELOCITY FIELDS OF LABORATORY TURBULENCE AT HIGH REYNOLDS NUMBERS

Mouri, Hideaki; Hori, Akihiro; Kawashima, Yoshihide

Pages: 105 –110

[The most elementary structures of turbulence, i.e., vortex tubes, are studied using laboratory velocity data for boundary layers with Reynolds numbersReλ = 295– 1258. We conduct conditional averaging for enhancements of a small-scale velocity increment and obtain the typical velocity profile for...

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