大気境界層中のトレーサガス濃度変動を対象とした数値計算 : (LESに基づく数値計算手法)(<小特集>:LES(ラージエディシミュレーション))

概要

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A numerical simulation model was developed to predict the instantaneous concentration fluctuation of a tracer gas plume and applied to stack gas diffusion on a flat plate. The flow field, including an instantaneous velocity component, was predicted using the LES (large eddy simulation) method. Then, concentration was calculated using the turbulence closure method, in which the LES is expanded for concentration, and the puff method, in which small pieces of the tracer gas are divided and combined according to the calculation mesh sizes. In order to avoid numerical viscous effects, the puff method was applied in the regions near to the tracer gas release point. Numerical calculation results for concentration fluctuation were compared with those obtained in a wind tunnel experiment, and good agreement was obtained for high concentrations of probability distribution functions.
一般社団法人日本機械学会の論文
2000-11-25