B-245 DNS による鉛直平板間の自然対流における大規模構造の解析

概要

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To make clear the relation between large-scale vortical structures and heat transfer of natural convection, a direct numerical simulation (DNS) is conducted for a flow having two different heated vertical walls. Rayleigh number (Ra), which is defined with the width of flow passage and temperatue difference betwen both walls, is 5.4×10^5,and Prandtl number (Pr) is 0.71. In our previous study, since it is found that the heat transfer was influenced by the large structures, we extracted the large-scale structure by means of proper orthogonal decomposition (POD). As a result, it is demonstrated that energetic mode is characterized by the rotational motion, whose axis is in the streamwise direction and of the scale is approximately the width of flow passage, and that the reconstructed flow structures with low-dimensional modes of velocity highly correlates to those of thermal field.
2003-07-28