Turbulent flow over a wavy surface: Stratified case

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

Research output: Contribution to journalArticle

15 Citations (Scopus)

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.

Original languageEnglish (US)
Article number2001JC900002
Pages (from-to)9295-9310
Number of pages16
JournalJournal of Geophysical Research: Oceans
Volume106
Issue numberC5
StatePublished - May 15 2001
Externally publishedYes

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turbulent flow
Turbulent flow
Turbulence
turbulence
stratified fluid
Richardson number
Froude number
stratified flow
Fluids
fluids
Reynolds stress
large eddy simulation
shear layers
Large eddy simulation
troughs
trough
sampling
Fluxes
Sampling
fluid

ASJC Scopus subject areas

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

Cite this

Calhoun, R., Street, R. L., & Koseff, J. R. (2001). Turbulent flow over a wavy surface: Stratified case. Journal of Geophysical Research: Oceans, 106(C5), 9295-9310. [2001JC900002].

Turbulent flow over a wavy surface : Stratified case. / Calhoun, Ronald; Street, Robert L.; Koseff, Jeffrey R.

In: Journal of Geophysical Research: Oceans, Vol. 106, No. C5, 2001JC900002, 15.05.2001, p. 9295-9310.

Research output: Contribution to journalArticle

Calhoun, R, Street, RL & Koseff, JR 2001, 'Turbulent flow over a wavy surface: Stratified case', Journal of Geophysical Research: Oceans, vol. 106, no. C5, 2001JC900002, pp. 9295-9310.
Calhoun R, Street RL, Koseff JR. Turbulent flow over a wavy surface: Stratified case. Journal of Geophysical Research: Oceans. 2001 May 15;106(C5):9295-9310. 2001JC900002.
Calhoun, Ronald ; Street, Robert L. ; Koseff, Jeffrey R. / Turbulent flow over a wavy surface : Stratified case. In: Journal of Geophysical Research: Oceans. 2001 ; Vol. 106, No. C5. pp. 9295-9310.
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