Growth dynamics of turbulent spots in plane Couette flow
arXiv:1702.02832 · doi:10.1017/jfm.2017.140
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.
References in corpus (7)
- Computational Study of Turbulent-Laminar Patterns in Couette Flow
- The rise of fully turbulent flow
- Turbulent-laminar patterns in plane Poiseuille flow
- Large scale flows in transitional plane Couette flow: a key ingredient of the spot growth mechanism
- Turbulent-laminar patterns in shear flows without walls
- An experimental study on turbulent-stripe structure in transitional channel flow
- Towards a model of large scale dynamics in transitional wall-bounded flows