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Turbulence Heat and Mass Transfer 5. Proceedings of the International Symposium on Turbulence Heat and Mass Transfer
September, 25-29, 2006, Dubrovnik, Croatia

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf


ISBN Print: 978-1-56700-229-4

ISSN: 2377-2816

Coherent structures and their frequency signature in the separated shear layer on the top of a square cylinder

pages 453-456
DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.920
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ABSTRAKT

The purpose of the present work is to study the various specific time scales of the turbulent separating flow around a square cylinder, in order to determine the Reynolds number effect on the separating shear layer, where occures a transition to turbulence. Unsteady analysis based on Large Eddy Simulation (LES) at intermediate Reynolds numbers and Laser Doppler Velocimetry (LDV) measurements at high Reynolds numbers are carried out. The Reynolds number, based on the cylinder diameter D and the inflow velocity Uo, is ranging from Re = 50 to Re = 215,000. We focus on the coherent structures developing on the top and in the wake of a square cylinder. For a large Reynolds number range above Re ≈ 1,000, both signatures of Von-Karman (VK) and Kelvin-Helmholtz (KH) type vortical structures are found on velocity time samples, the combination of their frequency signature is studied based on Fourier and wavelet analysis.

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