混合遷移を伴う空間発展乱流混合層の構造解明

概要

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Direct numerical simulation of a three-dimensional spatially developing turbulent mixing layer with mixing transition was conducted to investigate the structures of the mixing layer and the budgets of the transport equations of kinetic turbulent energy and Reynolds stresses. In the transport equation of (2, 2) component of Reynolds stress, the pressure diffusion term has a large value compared with the other terms, whereas it is very small in the budgets of (1, 1) and (3, 3) components. These results suggest that the model for the pressure diffusion term is very important for predicting turbulent flows with high accuracy. The influence of structures in the turbulent mixing layer on the budgets was also discussed. The production of kinetic turbulent energy and Reynolds stresses is governed by large-scale structures and streamwise vortices even after the transition. However, the dissipation of kinetic turbulent energy after the transition is dominated by small-scale vortex tubes in large-scale structures and streamwise vortices in the braid regions. The dominant structure for the transport mechanism and the redistribution mechanism of turbulent energy change from large-scale structures to small-scale vortices with mixing transition.
一般社団法人日本機械学会の論文
1996-02-25