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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Druckformat: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v35.i6.60
pages 581-593

Combined Effect of Short Roughness Strip and Concentrated Wall Suction on Coherent Structure in a Turbulent Boundary Layer

M. O. Oyewola
Department of Mechanical Engineering University of Ibadan Ibadan, Nigeria
A. A. Adesina
School of Chemical Engineering and Industrial Chemistry, University of New South Wales,

ABSTRAKT

Hot-wire measurements have been undertaken in a turbulent boundary layer in order to examine the combined effect of short roughness strip and localized wall suction on near-wall coherent structures. The short roughness strip is placed immediately after the suction strip and the suction is applied through a short porous strip for a range of suction rates. The results of Reynolds stresses indicate that the pseudo-equilibrium of the organized motion of the layer have been altered due to the suppression of the near-wall coherent structures. This is evident in the attenuation of the spectra and co-spectra relative to the undisturbed layer. Although, short roughness strip altered the magnitude and wavelength of the effect of suction on the layer, the results suggest that the short roughness strip and suction act independently on the mechanism of the layer.