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Titolo:
Turbulent flow over a wavy surface: Stratified case
Autore:
Calhoun, RJ; Street, RL; Koseff, JR;
Indirizzi:
Stanford Univ, Dept Civil & Environm Engn, Environm Fluid Mech Lab, Stanford, CA 94305 USA Stanford Univ Stanford CA USA 94305 luid Mech Lab, Stanford, CA 94305 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
fascicolo: C5, volume: 106, anno: 2001,
pagine: 9295 - 9310
SICI:
0148-0227(20010515)106:C5<9295:TFOAWS>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
LARGE-EDDY SIMULATIONS; SUBGRID-SCALE MODEL; CHANNEL FLOW;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Calhoun, RJ Stanford Univ, Dept Civil & Environm Engn, Environm Fluid MechLab, Stanford, CA 94305 USA Stanford Univ Stanford CA USA 94305 b, Stanford, CA 94305 USA
Citazione:
R.J. Calhoun et al., "Turbulent flow over a wavy surface: Stratified case", J GEO RES-O, 106(C5), 2001, pp. 9295-9310

Abstract

Stably stratified turbulent flow over wavy terrain is investigated using large-eddy simulation for laboratory-scale domains. Basic near-wall turbulence structure and production mechanisms appear similar to the neutral case, though dampened. The state of turbulence in the stratified fluid is analyzed by graphing the relationships between key nondimensional parameters. A shifting and smearing of the curve of flux Richardson number Ri(f) versus turbulent Froude number Fr-t caused by the wavy boundary (compared with a flatboundary) demonstrates the higher level of turbulence near the wavy wall and shows strong mixing in the detached shear layer over the trough. The relationship describing the state of turbulence in a stratifed fluid given by Ivey and Imberger [1991] is approximately satisfied. Conditional sampling is used to analyze the nature of Reynolds stress events.

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Documento generato il 29/05/20 alle ore 16:58:41