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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN 打印: 1-56700-135-1

LONGITUDINAL AND SPANWISE STRUCTURES IN A TURBULENT WAKE

Abstract

Approximations to the three vorticity components ωx, ωy and ωz have been simultaneously obtained using a combination of four X-wires in the near-wake of a circular cylinder. The present objective is to investigate the likely spatial relationship between longitudinal and spanwise vortical structures. Conditional distributions of ωx, and ωy, based on detections of spanwise structures, indicated that the longitudinal structures are located upstream of the saddle point. The angles of the vorticity vector suggest that the most likely inclination, to the x-axis, of longitudinal structures is about 50°, aligned with the diverging separatrix between two consecutive spanwise structures. About 40% of ωx2, and ωy2, occur within the spanwise vortical structures, apparently resulting from the three-dimensionality of the structures, while the non-vortical regions account for 60%, which is largely attributed to the longitudinal structures. Spanwise structures also account for about 60−80% of ωz2.
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