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Growth dynamics of turbulent spots in plane Couette flow

Abstract : 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: growth induced by large scale advection or growth by destabilization, are discussed for the different stages of the spot growth. A scenario which 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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Contributor : Romain Monchaux Connect in order to contact the contributor
Submitted on : Monday, July 23, 2018 - 2:38:09 PM
Last modification on : Wednesday, May 11, 2022 - 3:14:03 PM
Long-term archiving on: : Wednesday, October 24, 2018 - 1:59:21 PM


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  • HAL Id : hal-01847301, version 1


Marie Couliou, Romain Monchaux. Growth dynamics of turbulent spots in plane Couette flow. Journal of Fluid Mechanics, 2017. ⟨hal-01847301⟩



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