Abstract
This paper presents observations and investigations of the turbulent heat-transfer structures in boundary layers with separation and reattachment by means of direct numerical simulation (DNS). Flow separation and reattachment are caused by step or obstacle of the wall. Thus, in order to observe effects of shape of wall for the turbulent heat-transfer in boundary layer, various heights and widths of 2D hill and various heights of forward-facing step are arranged in DNS. Also, the wall thermal condition is set by constant wall temperature in all cases. The results of DNS reveal the turbulent statistics, characteristics and structures of turbulent heat-transfer in boundary layers with with separation and reattachment, i.e., the detailed phenomena of turbulent heat-transfer in boundary layer with separation and reattachment are obviously demonstrated.
