Turbulent flow over a wavy surface: Neutral case

Ronald J. Calhoun, Robert L. Street

Research output: Contribution to journalArticle

70 Scopus citations

Abstract

In many geophysical flows the passage of a turbulent fluid over a wavy surface significantly affects quantities of interest, such as momentum flux, mixing, and transport of scalars. Large-eddy simulation is used here to investigate neutrally stratified flow over a wavy bed. A wavy surface tends to organize the turbulent flow by imposing its wavelength and phase on the near-wall field. Both instantaneous turbulent structures and turbulence statistics provide evidence of this organization. For example, a vortex identification method applied to the instantaneous flow field reveals streamwise vortices that are locked into a phase relationship with the wavy boundary. These vortices may be linked to a Görtier instability mechanism caused by the wavy wall. Statistical analyses are also presented to gain insights into the effect of the wavy surface. In particular, we compare the effects of three different hill heights. Finally, a brief analysis of the components of drag is given.

Original languageEnglish (US)
Article number2000JC900133
Pages (from-to)9277-9293
Number of pages17
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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