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

Mark A. Miller, Alexandre Martin, Sean C.C. Bailey

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 (US)
Title of host publicationInternational Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
PublisherTSFP-8
ISBN (Electronic)9780000000002
StatePublished - Jan 1 2013
Event8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013 - Poitiers, France
Duration: Aug 28 2013Aug 30 2013

Publication series

NameInternational Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
Volume3

Other

Other8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
CountryFrance
CityPoitiers
Period8/28/138/30/13

Fingerprint

Blow molding
Turbulent flow
Surface roughness
Turbulence
Channel flow
Kinetic energy
Momentum
Reynolds number
Statistics

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes

Cite this

Miller, M. A., Martin, A., & Bailey, S. C. C. (2013). Experimental investigation of blowing effects on turbulent flow over a rough surface. In International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013 (International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013; Vol. 3). TSFP-8.
Miller, Mark A. ; Martin, Alexandre ; Bailey, Sean C.C. / Experimental investigation of blowing effects on turbulent flow over a rough surface. International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013. TSFP-8, 2013. (International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013).
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Miller, MA, Martin, A & Bailey, SCC 2013, Experimental investigation of blowing effects on turbulent flow over a rough surface. in International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013. International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, vol. 3, TSFP-8, 8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, Poitiers, France, 8/28/13.

Experimental investigation of blowing effects on turbulent flow over a rough surface. / Miller, Mark A.; Martin, Alexandre; Bailey, Sean C.C.

International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013. TSFP-8, 2013. (International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013; Vol. 3).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - 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.

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Miller MA, Martin A, Bailey SCC. Experimental investigation of blowing effects on turbulent flow over a rough surface. In International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013. TSFP-8. 2013. (International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013).