Abstract
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.
Original language | English |
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Title of host publication | Journal of Physics |
Subtitle of host publication | Conference Series |
Publisher | IOP Publishing |
Volume | 1001 |
Edition | 1 |
DOIs | |
Publication status | Published - 12 Apr 2018 |
Event | Madrid Summer School on Turbulence 2017 - Universidad Politécnica de Madrid, Madrid, Spain Duration: 29 May 2017 → 30 Jun 2017 Conference number: 3rd http://iopscience.iop.org/issue/1742-6596/1001/1 (Proceedings) http://iopscience.iop.org/issue/1742-6596/1001/1 (Proceedings) http://iopscience.iop.org/issue/1742-6596/1001/1 (Proceedings) |
Publication series
Name | Journal of Physics: Conference Series |
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Publisher | IOP Publishing |
ISSN (Print) | 1742-6588 |
Conference
Conference | Madrid Summer School on Turbulence 2017 |
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Country/Territory | Spain |
City | Madrid |
Period | 29/05/17 → 30/06/17 |
Internet address |
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