C-233 ハイブリッド DNS/LES を用いた気液界面における高シュミット数乱流物質輸送の数値計算

概要

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A hybrid DNS/LES scheme, in which DNS with high-resolution grids is applied within the near-surface region while LES with relatively coarse grids in the outer region, has been developed in order to calculate gas absorption into liquid across an air-water interface at the high Schmidt number of Sc_L=100. The gas transfer rate is well compared with that previously obtained by a Lagrangian method. The concentration field near the interface is characterized by fine-scale high concentration streaks produced by the interfacial shear and low concentration spots associated with upwelling flows which impinge on the interface, i. e., splatting. From visualization, it is observed that quasi-streamwise vortices in liquid, which are scaled by the shear units, govern the splatting events and enhance the interfacial mass transfer by replacing the near-surface fluids with those beneath the interface.
日本流体力学会の論文
2003-07-28