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Numerical simulations of boundary-layer transition induced by a cylinder wake

Published online by Cambridge University Press:  11 January 2006

VICTOR OVCHINNIKOV ,
UGO PIOMELLI  and
MEELAN M. CHOUDHARI
VICTOR OVCHINNIKOV
Affiliation:
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
UGO PIOMELLI
Affiliation:
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
MEELAN M. CHOUDHARI
Affiliation:
NASA Langley Research Center, Hampton, VA 23681, USA
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Abstract

Direct and large-eddy simulations of the interaction between a laminar boundary layer and a von Kármán vortex street behind a circular cylinder are carried out for three values of the Reynolds number based on the cylinder diameter and free-stream velocity: $\hbox{\it Re}_D\,{=}\,385$, 1155 and 3900. Rapid, bypass-like transition to turbulence is observed in the two higher-Reynolds-number cases. Flow statistics in the transitional and turbulent regions are examined, followed by an investigation of the underlying transition mechanism. Qualitative similarities between wake-induced transition and bypass transition due to free-stream turbulence are discussed and the challenges of predicting boundary-layer transition in this complex environment are pointed out.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 547 , 25 January 2006 , pp. 413 - 441
Copyright
© 2006 Cambridge University Press

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