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.
Complete list of metadatas

Cited literature [32 references]  Display  Hide  Download

https://hal-ensta-paris.archives-ouvertes.fr//hal-01847301
Contributor : Romain Monchaux <>
Submitted on : Monday, July 23, 2018 - 2:38:09 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:06 AM
Long-term archiving on : Wednesday, October 24, 2018 - 1:59:21 PM

Files

JFM_GrowthTemp_VR2.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : hal-01847301, version 1

Citation

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

Share

Metrics

Record views

131

Files downloads

321