Turbulent flows with incipient separation over solid waves

J. D. Kuzan, T. J. Hanratty, R. J. Adrian

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Measurements of the streamwise velocity over solid sinusoidal waves with height to wavelength ratios of 2 a/λ=0.05, 0.125 and with dimensionless wave numbers α+=0.00624, 0.00135 have been made. For these conditions the instantaneous flow reverses direction, but the time-averaged flow is non-separated. Many features of the flow are similar to those reported in previous papers for a time-averaged flow that is separated. Approximate agreement is obtained from an eddy viscosity model derived for flow over small amplitude waves. However, the differences are more interesting than the agreement in that they point out shortcomings of present Reynolds stress models. Comparison with other measurements in the literature shows how increasing Reynolds number decreases the size of the separated region. Measurements of pressure profiles and of drag are interpreted in terms of measured flow patterns.

Original languageEnglish (US)
Pages (from-to)88-98
Number of pages11
JournalExperiments in Fluids
Volume7
Issue number2
DOIs
StatePublished - Nov 1 1989
Externally publishedYes

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

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