Journal
JOURNAL OF FLUID MECHANICS
Volume 819, Issue -, Pages 1-20Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2017.140
Keywords
instability; transition to turbulence
Categories
Funding
- ANR Jeunes Chercheurs/Jeunes Chercheuses QANCOUET
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We experimentally and numerically investigate the temporal aspects of turbulent spots spreading in a plane Couette flow for transitional Reynolds numbers between 300 and 450. Spot growth rate, spot advection rate and large-scale flow intensity are measured as a function of time and Reynolds number. All these quantities show similar dynamics clarifying the role played by large-scale flows in the advection of the turbulent spot. The contributions of each possible growth mechanism, that is, growth induced by large-scale advection or growth by destabilization, are discussed for the different stages of the spot growth. A scenario that gathers all these elements is providing a better understanding of the growth dynamics of turbulent spots in plane Couette flow that should possibly apply to other extended shear flows.
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