Reynolds number effect on the dissipation function in wall-bounded flows

Faouzi Laadhari (1)

1 LMFA - Laboratoire de Mecanique des Fluides et d'Acoustique

The evolution with Reynolds number of the dissipation function, normalized by wall variables, is investigated using direct numerical simulation (DNS) databases for incompressible turbulent Poiseuille flow in a plane channel, at friction Reynolds numbers up to Reτ = 2000. DNS results show that the mean part, directly dissipated by the mean flow, reaches a constant value while the turbulent part, converted into turbulent kinetic energy before being dissipated, follows a logarithmic law. This result shows that the logarithmic law of friction can be obtained without any assumption on the mean velocity distribution. The proposed law is in good agreement with experimental results in plane-channel and boundary layer flows.

Mots clés: channel flow; turbulence; Poiseuille flow; boundary layers

Domaines: Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]

Faouzi Laadhari. Reynolds number effect on the dissipation function in wall-bounded flows. Physics of Fluids, 2007, 19 (3), pp.038101. ⟨10.1063/1.2711480⟩. ⟨hal-00745571⟩