Abstract
In this study, turbulent heat transfer in thermally-stratified turbulent boundary layers over a 2-dimensional hill (2DH) is investigated by means of direct numerical simulation (DNS). Since 2DH often yields a flow separation and reattachment and has the effect of curvature wall, both velocity and thermal fields are affected by these, and thermal stratification also influences these fields, where the thermal stratifications are set to stable, neutral and unstable conditions in the DNS. The results of DNS show the effects of the wall shape and the thermal stratifications to the turbulent boundary layer, and indicate the fundamental and detailed characteristics and structures of turbulent heat transfer in various thermally-stratified turbulent boundary layers over a 2DH.
