Experimental measurements in plane Couette–Poiseuille flow: dynamics of the large- and small-scale flow

Klotz, Lukasz; Pavlenko, A. M.; Wesfreid, José Eduardo

doi:10.1017/jfm.2020.1089

Cited by 20 publications

(14 citation statements)

References 105 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have described the evolution of a band in a narrow tilted domain during a decay or a splitting event via Fourier spectral decomposition. During a band decay, small-scale structures, streaks and rolls, are damped more quickly, increasing the relative prominence of the large-scale flow parallel to [14,26,29,36,37] or around [36,37,54,55] a turbulent patch or band. All of our realizations have the same exponential decay rate at the end of the process.…”

Section: Discussionmentioning

confidence: 99%

Statistical transition to turbulence in plane channel flow

Gomé,

Tuckerman,

Barkley

2020

Preprint

View full text Add to dashboard Cite

Intermittent turbulent-laminar patterns characterize the transition to turbulence in pipe, plane Couette and plane channel flows. The time evolution of turbulent-laminar bands in plane channel flow is studied via direct numerical simulations using the parallel pseudospectral code ChannelFlow in a narrow computational domain tilted by 24 • with respect to the streamwise direction. Mutual interactions between bands are studied through their propagation velocities. Profiles show that the flow surrounding isolated turbulent bands returns to the laminar base flow over large distances. Depending on the Reynolds number, a turbulent band can either decay to laminar flow or split into two bands. As with past studies of other wall-bounded shear flows, in most cases survival probability distributions are found to be exponential for both decay and splitting, indicating that the processes are memoryless. Statistically estimated mean lifetimes for decay and splitting are plotted as a function of the Reynolds number and lead to the estimation of a critical Reynolds number Recross 950, where decay and splitting lifetimes cross at greater than 10 6 advective time units. The processes of splitting and decay are also examined through analysis of their Fourier spectra. The dynamics of large-scale spectral components seem to statistically follow the same pathway during the splitting of a turbulent band and may be considered as precursors of splitting.

show abstract

Section: Discussionmentioning

confidence: 99%

Statistical transition to turbulence in plane channel flow

Gomé,

Tuckerman,

Barkley

2020

Preprint

View full text Add to dashboard Cite

show abstract

“…The definition is also independent of the reference frame, and immediately applies to unusual flow configurations such as Poiseuille flows with no flow rate (Tuckerman et al. 2014) or experimental results for Couette and Couette–Poiseuille flows (Kawata & Alfredsson 2019; Klotz, Pavlenko & Wesfreid 2021).…”

Section: The Cpi Framework For the Couette–poiseuille Flow Familymentioning

confidence: 99%

Global energy budgets in turbulent Couette and Poiseuille flows

2021

View full text Add to dashboard Cite

show abstract

“…LSFs in wall-bounded shear flows arise from the non-zero spanwise velocity component (Duguet & Schlatter 2013), and a small contribution from the imperfections of the membrane in the channel. The scale separation in the present set-up was investigated by Klotz, Pavlenko & Wesfreid (2021).…”

Section: Small Scalesmentioning

confidence: 99%