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Effect of a mesh on boundary layer transitions induced by free-stream turbulence and an isolated roughness element

Published online by Cambridge University Press:  07 May 2015

P. Phani Kumar ,
A. C. Mandal  and
J. Dey
P. Phani Kumar
Affiliation:
Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560012, India
A. C. Mandal
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology, Kanpur, UP 208016, India
J. Dey*
Affiliation:
Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560012, India
*
†Email address for correspondence: jd@aero.iisc.ernet.in
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Abstract

Streamwise streaks, their lift-up and streak instability are integral to the bypass transition process. An experimental study has been carried out to find the effect of a mesh placed normal to the flow and at different wall-normal locations in the late stages of two transitional flows induced by free-stream turbulence (FST) and an isolated roughness element. The mesh causes an approximately 30 % reduction in the free-stream velocity, and mild acceleration, irrespective of its wall-normal location. Interestingly, when located near the wall, the mesh suppresses several transitional events leading to transition delay over a large downstream distance. The transition delay is found to be mainly caused by suppression of the lift-up of the high-shear layer and its distortion, along with modification of the spanwise streaky structure to an orderly one. However, with the mesh well away from the wall, the lifted-up shear layer remains largely unaffected, and the downstream boundary layer velocity profile develops an overshoot which is found to follow a plane mixing layer type profile up to the free stream. Reynolds stresses, and the size and strength of vortices increase in this mixing layer region. This high-intensity disturbance can possibly enhance transition of the accelerated flow far downstream, although a reduction in streamwise turbulence intensity occurs over a short distance downstream of the mesh. However, the shape of the large-scale streamwise structure in the wall-normal plane is found to be more or less the same as that without the mesh.

JFM classification

Boundary Layers: Boundary layer control Boundary Layers: Boundary Layers Instability: Transition to turbulence
Type
Papers
Information
Journal of Fluid Mechanics , Volume 772 , 10 June 2015 , pp. 445 - 477
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© 2015 Cambridge University Press 

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