Large-Eddy Simulationによる大気境界層中のトレーサガス濃度変動予測(流体工学,流体機械)

概要

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A Large-Eddy Simulation (LES) based on a finite-difference scheme is applied to stack gas diffusion of a turbulent boundary layer. A Flux-Corrected Transport (FCT) scheme is used to prevent a numerical oscillation and a negative concentration in the LES. Furthermore, a beta-Probability Density Function (PDF) model, which considers a Subgird Scale (SGS) concentration fluctuation, is applied to predict the detailed concentration statistics such as an instantaneous high concentration and an intermittency factor of the concentration in a coarse grid resolution. The validity of these methods is confirmed to compare the results of the LES with the wind tunnel measurements. The results show the predictions of the mean concentration and mean squared concentration fluctuation are in good agreement with the measurement and the present LES using the FCT scheme is applicable to the stack gas diffusion. The present method, which takes account of the concentration fluctuation, can exactly predict the instantaneous high concentration value and intermittent factor even in the coarse grid resolution.
一般社団法人日本機械学会の論文
2003-04-25