Author(s)

O. Labbe, E. Montreuil & P. Sagaut

Abstract

A large-eddy simulation (LES) of the flow over a backward-facing step was con- ducted to investigate the heat transfer phenomena in the reattachment zone. The Navier-Stokes equations for an incompressible fluid with the temperature field con- sidered as a passive scalar, are solved using a second-order accurate scheme in space and time. In order to have a fully turbulent flow in the domain, an auxiliary simu- lation is carried out to provide unsteady velocity and temperature fields at the en- trance to the backward-facing step. The Mixed Scale Subgrid Model is used for the momentum equations while a scalar subgrid diffusivity model is employed for the temperature equation. The Reynolds number based on the bulk velocity (Ub) at the entrance and the step height (h) is 66 100. The mean reattachment point

Keywords