The Proceedings of the Fluids engineering conference
Online ISSN : 2424-2896
2024
Session ID : OS05-02
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Stereo PIV Measurement of Vortices in Turbulent Boundary Layer Flow Controlled by Traveling Wave-like Wall Deformation
*Kohki ITOTomohiro NIMURAAkira MURATAKaoru IWAMOTO
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Abstract

Streamwise vortices increase friction drag in a turbulent boundary layer by vigorous momentum transport near the wall. This study aims to clarify the change of vortical structure with decreasing turbulence in turbulent boundary layer flows where drag is reduced by traveling wavy control. A three-dimensional velocity field was constructed for a flow with a developed turbulent boundary layer using stereo PIV of the channel cross-section multiple times and the Taylor hypothesis. Although traveling wave control did not eliminate the streamwise vortices throughout the entire region, the vorticity in the streamwise direction tended to decrease. Furthermore, the instantaneous vorticity fields at each cross-section revealed that the streamwise vortices were restricted below y+ < 50 and that their shape and position in the wall-normal direction changed according to the wall deformation.

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© 2024 The Japan Society of Mechanical Engineers
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