Turbulent flow over a wavy surface: Stratified case

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

Research output: Contribution to journalArticle

15 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 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

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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    Calhoun, R. J., 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].