Abstract
In wall jet region of impingement jet, installation of rib turbulator is an effective technique to prevent rapid decay of local heat transfer. Two-dimensional impingement jet cooling on ribbed walls has been studied by Concurrent-LES to reveal the effect of rib-height on heat transfer enhancement. As a result of simulations, higher rib-height was found to be effective to enhance heat transfer. The use of Concurrent-LES and correlation coefficient realized the direct and quantitative comparison of instantaneous turbulent structure among two different ribs. It was confirmed that turbulent structures are not affected by the rib height in the upstream, but much affected in the downstream.
