Turbulent flow over a wavy surface: Stratified case

Ronald J. Calhoun; Robert L. Street; Jeffrey R. Koseff

doi:10.1029/2001jc900002

Turbulent flow over a wavy surface: Stratified case

Ronald J. Calhoun, Robert L. Street, Jeffrey R. Koseff

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

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 flat boundary) 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.

Original language	English (US)
Article number	2001JC900002
Pages (from-to)	9295-9310
Number of pages	16
Journal	Journal of Geophysical Research: Oceans
Volume	106
Issue number	C5
DOIs	https://doi.org/10.1029/2001jc900002
State	Published - May 15 2001
Externally published	Yes

ASJC Scopus subject areas

Geochemistry and Petrology
Geophysics
Earth and Planetary Sciences (miscellaneous)
Space and Planetary Science
Atmospheric Science
Astronomy and Astrophysics
Oceanography

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10.1029/2001jc900002

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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 Rif versus turbulent Froude number Frt caused by the wavy boundary (compared with a flat boundary) 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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AU - Street, Robert L.

AU - Koseff, Jeffrey R.

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Y1 - 2001/5/15

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AB - 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 Rif versus turbulent Froude number Frt caused by the wavy boundary (compared with a flat boundary) 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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Turbulent flow over a wavy surface: Stratified case

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