抄録
Direct numerical simulation has been performed for the turbulent heat transfer in a channel flow obstructed by square ribs at Re_τ=80 and Pr=0.71. The constant wall temperature difference was applied between the walls for thermal boundary condition. The remarkable enhancement of the heat transfer is observed through the averaged Nusselt number Nu by comparison with the channel flow without the ribs. In particular, the local Nu increases around the upstream of the rib owing to the existence of the strong horseshoe vortices. The thermal turbulence statistics and the visualization of the instantaneous temperature fluctuations are also obtained to examine the effect of the ribs on the thermal field.
