安定成層下にある境界層の乱流特性(乱流渦構造(1),一般講演)

概要

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This paper presents a numerical study of turbulent thermal boundary layer under various stable stratifications by means of direct numerical simulation (DNS) which is carried out to explore the turbulent structures and statistics. The respective influences of a weak, and a strong, stable thermal stratification are investigated in DNS. The DNS results show the quantitative turbulent statistics of weak, and strong, stable thermal boundary layers, in which the characteristic transport phenomena of thermally stratified boundary layers are demonstrated. In particular, the counter gradient diffusion phenomenon is found in a strong, stable stratified boundary layer in both velocity and thermal fields, i.e., Reynolds shear stress and the wall-normal turbulent heat-flux indicate a counter sign as compared with those of the neutral boundary layer.
日本流体力学会の論文
2007-08-06