期刊
JOURNAL OF FLUID MECHANICS
卷 646, 期 -, 页码 127-136出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0022112009993296
关键词
-
资金
- Marie Curie Fellowship [PIEF-GA-2008-219223]
The onset of shear flow turbulence is characterized by turbulent patches bounded by regions of laminar flow. At low Reynolds numbers localized turbulence relaminarizes, raising the question of whether it is transient in nature or becomes sustained at a critical threshold. We present extensive numerical simulations and a detailed statistical analysis of the lifetime data, in order to shed light on the sources of the discrepancies present in the literature. The results are in excellent quantitative agreement with recent experiments and show that turbulent lifetimes increase super-exponentially with Reynolds number. In addition, we provide evidence for a lower bound below which there are no meta-stable characteristics of the transients, i.e. the relaminarization process is no longer memoryless.
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