円形壁面衝突噴流場の乱流熱伝達構造に関するDNS研究

抄録

The objectives of this study are to observe and investigate characteristics of near-wall turbulent heat transfer phenomena caused by a round impinging jet by means of direct numerical simulation (DNS). In order to accurately investigate such phenomena, DNS is very useful tool as far as we know. The DNS of near-wall turbulent heat transfer phenomena caused by round impinging jet with isothermal impingement wall is conducted under conditions of various impingement distances to investigate effect of impingement distance. In a round impinging jet, since a bulk flow rate decreases toward streamwise direction on the impingement wall due to increase in the cross-sectional area, heat transfer is also suppressed in the down-stream region on it. Thus, because a remarkable enhancement of heat transfer occurs around a stagnation point, it is important to know the effect of impingement distance for the near-wall heat transfer phenomena. As results of DNS, both detailed characteristics and statistics of near-wall turbulent heat transfer phenomena caused by a round impinging jet are clearly obtained.