DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal
ISBN Print: 978-1-56700-302-4
ISSN: 2377-2816
Turbulent-Laminar Patterns in Poiseuille and Couette flows
RESUMO
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.