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THMT-12. Proceedings of the Seventh International Symposium On Turbulence Heat and Mass Transfer
September, 24-27, 2012, Palermo, Italy

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal


ISBN Print: 978-1-56700-302-4

ISSN: 2377-2816

Turbulent-Laminar Patterns in Poiseuille and Couette flows

pages 2432-2438
DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2510
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ABSTRAKT

Direct numerical simulations of a spectral method are performed to study the turbulent-laminar patterns in the turbulent Poiseuille and Couette flows at low-Reynolds numbers, where the quasi-laminar and turbulent regions simultaneously appear and form the stripe pattern. The turbulent regions are pinned down by subtracting their advection velocity from the mean flow. Turbulent statistics are temporarily and spatially averaged over the striding direction. Averaged flow structure in the lower half of the Poiseuille flow is quite similar to the flow structure in the entire Couette flow despite the difference in mean velocity gradient, when it comes to the turbulent-laminar pattern.

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