Investigation of the scaling of roughness and blowing effects on turbulent channel flow
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A turbulent channel flow facility was used to study the scaling of the combined effects of roughness and flow injection on the mean flow and turbulence characteristics of turbulent plane Poiseuille flow. 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. This analogy broke down for the turbulence statistics in that the addition of blowing resulted in behavior which did not follow that predicted by Townsend’s hypothesis. Instead, the outer-scaled Reynolds stress was found to deviate from that for the rough-walled boundary condition without blowing well into the outer layer. It was found that this deviation from the expected Reynolds stress scaling behavior was caused by the suppression of kinetic energy content associated with large-scale motions.
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).
- Gritsevich M, Kuznetzova D, Sibgatullin I (2012) Coupling of blowing and roughness effects in the spalart-allmaras turbulence model. In 9th International planetary probe workshop. Toulouse, FranceGoogle Scholar
- Healzer JM, Moffat R, Kays W (1974) The turbulent boundary layer on a rough, porous plate: experimental heat transfer with uniform blowing. Technical Report HMT-18, Stanford University CA Thermosciences DivisionGoogle Scholar
- Holden M, Bergman R, Harvey J, Duryea G, Moselle J (1988) Studies of the structure of attached and separated regions of viscous/inviscid interaction and the effects of combined surface roughness and blowing in highe reynolds number hypersonic flows. Technical Report CUBRC-88682, Calspan UB Research Center Buffalo NYGoogle Scholar
- Monty JP (2005) Developments in smooth wall turbulent duct flows. Ph.D thesis. University of MelbourneGoogle Scholar
- Vigdorovich I, Oberlack M (2008) Analytical study of turbulent poiseuille flow with wall transpiration. Phys Fluids 20:055102Google Scholar
- Voisinet R (1979) Influence of roughness and blowing on compressible turbulent boundary layer flow. Technical report, Naval SurfaceWeapons Center, White Oak Lab, Silver Spring, MDGoogle Scholar