Experimental investigation of blowing effects on turbulent flow over a rough surface

Research output: Contribution to conferencePaperpeer-review

Abstract

A high Reynolds number turbulent channel flow facility was used to study the combined effects of roughness and flow injection on the mean flow and turbulence characteristics. It was found that the additional momentum injection through the surface enhanced the roughness effects and for the mean flow the effect of blowing was indistinguishable from that of increased roughness. However, for the turbulence statistics, this analogy broke down in that the addition of blowing resulted in behavior which did not follow that predicted by Townsend's hypothesis. This was observed as a reduction of outer-scaled Reynolds stress well into the outer layer. The reduction in Reynolds stress was accomplished primarily by a suppression of the kinetic energy content associated with large-scale motions, which are believed to be formed at the surface but extend into the outer layer.

Original languageEnglish
StatePublished - 2013
Event8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013 - Poitiers, France
Duration: Aug 28 2013Aug 30 2013

Conference

Conference8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
Country/TerritoryFrance
CityPoitiers
Period8/28/138/30/13

Bibliographical note

Funding Information:
This work was supported by a NASA Office of the Chief Technologist’s Space Technology Research Fellowship (grant number NNX12AN20H) and by Commonwealth of Kentucky funding in association with a NASA EPSCoR award (grant number NNX10AV39A).

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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