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

作者：Victor Ovchinnikov, Ugo Piomelli, Meelan M. Choudhari · 发表于：Journal of Fluid Mechanics · 年份：2006 · DOI：10.1017/s0022112005007342 · 被引用次数：61 · 研究领域：Fluid Dynamics and Turbulent Flows、Fluid Dynamics and Vibration Analysis、Wind and Air Flow Studies

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.