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Turbulent-Laminar Patterns in Poiseuille and Couette flows

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

Koji Fukudome
Department of Mechanical Engineering, and also Department of Engineering Physics, Electronics and Mechanics, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan

Oaki Iida
Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan


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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