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Titolo:
Numerical modeling of initially turbulent wakes with net momentum
Autore:
Gourlay, MJ; Arendt, SC; Fritts, DC; Werne, J;
Indirizzi:
NW Res Associates Inc, Colorado Res Associates Div, Boulder, CO 80302 USA NW Res Associates Inc Boulder CO USA 80302 tes Div, Boulder, CO 80302 USA
Titolo Testata:
PHYSICS OF FLUIDS
fascicolo: 12, volume: 13, anno: 2001,
pagine: 3783 - 3802
SICI:
1070-6631(200112)13:12<3783:NMOITW>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRATIFIED FLUIDS; STABLE STRATIFICATION; VORTEX STRUCTURE; SPHERE; EVOLUTION; MOTIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Gourlay, MJ NW Res Associates Inc, Colorado Res Associates Div, 3380 Mitchell Lane, Boulder, CO 80302 USA NW Res Associates Inc 3380 Mitchell Lane Boulder CO USA 80302
Citazione:
M.J. Gourlay et al., "Numerical modeling of initially turbulent wakes with net momentum", PHYS FLUIDS, 13(12), 2001, pp. 3783-3802

Abstract

This paper presents results from the first fully three-dimensional direct numerical simulations of initially turbulent wakes with net momentum in unstratified and density stratified fluids. The initial conditions contain a super-position of an initially axisymmetric mean streamwise velocity profileplus a spectrally specified fluctuation velocity field with initially incoherent phases to model initial turbulence. To provide evidence in favor of their validity, we compare results from these simulations with previous measurements behind towed bodies in wind tunnels and towing tanks, and also compare with theories of turbulent wakes. Comparisons with laboratory flow experiments provide agreement, both with statistical quantities and vortex structures and evolution. We subsequently investigate open questions by analysis of the fully three-dimensional flow. Coherent vortices in stratified wakes have their origins in the vortex geometry of the mean wake flow, and donot require stratification or coherent seeding in the initial velocity fluctuations. We conclude that the simulations provide a trustworthy and valuable complement to wake research, and that the vortex structures result froma combination of the necessity that vortices form loops and diffusion of vorticity to smooth the loops into rings. (C) 2001 American Institute of Physics.

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Documento generato il 19/09/20 alle ore 21:27:30