TY - JOUR
T1 - Characterisation of minimal-span plane Couette turbulence with pressure gradients
AU - Sekimoto, Atsushi
AU - Atkinson, Callum
AU - Soria, Julio
N1 - Funding Information:
This work was funded in part by the Coturb program of the European Research Council (ERC). The authors would like to acknowledge the support from the Australian Research Council (ARC) for this work which is gratefully acknowledged. Dr Atkinson was supported by an ARC Discovery Early Career Researcher Award (DECRA) fellowship. The computational resources were provided by the Australian National Computational Infrastructure (NCI) through NCMAS which is supported by the Australian government. The authors are grateful to Dr. J. Cardesa for his helpful comments on the manuscript.
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2018/4/12
Y1 - 2018/4/12
N2 - The turbulence statistics and dynamics in the spanwise-minimal plane Couette flow with pressure gradients, so-called, Couette-Poiseuille (C-P) flow, are investigated using direct numerical simulation. The large-scale motion is limited in the spanwise box dimension as in the minimal-span channel turbulence of Flores & Jiménez (Phys. Fluids, vol. 22, 2010, 071704). The effect of the top wall, where normal pressure-driven Poiseuille flow is realised, is distinguished from the events on the bottom wall, where the pressure gradient results in mild or almost-zero wall-shear stress. A proper scaling of turbulence statistics in minimal-span C-P flows is presented. Also the 'shear-less' wall-bounded turbulence, where the Corrsin shear parameter is very weak compared to normal wall-bounded turbulence, represents local separation, which is also observed as spanwise streaks of reversed flow in full-size plane C-P turbulence. The local separation is a multi-scale event, which grows up to the order of the channel height even in the minimal-span geometry.
AB - The turbulence statistics and dynamics in the spanwise-minimal plane Couette flow with pressure gradients, so-called, Couette-Poiseuille (C-P) flow, are investigated using direct numerical simulation. The large-scale motion is limited in the spanwise box dimension as in the minimal-span channel turbulence of Flores & Jiménez (Phys. Fluids, vol. 22, 2010, 071704). The effect of the top wall, where normal pressure-driven Poiseuille flow is realised, is distinguished from the events on the bottom wall, where the pressure gradient results in mild or almost-zero wall-shear stress. A proper scaling of turbulence statistics in minimal-span C-P flows is presented. Also the 'shear-less' wall-bounded turbulence, where the Corrsin shear parameter is very weak compared to normal wall-bounded turbulence, represents local separation, which is also observed as spanwise streaks of reversed flow in full-size plane C-P turbulence. The local separation is a multi-scale event, which grows up to the order of the channel height even in the minimal-span geometry.
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U2 - 10.1088/1742-6596/1001/1/012020
DO - 10.1088/1742-6596/1001/1/012020
M3 - Conference article
AN - SCOPUS:85046099081
SN - 1742-6588
VL - 1001
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012020
T2 - 3rd Madrid Summer School on Turbulence
Y2 - 29 May 2017 through 30 June 2017
ER -