APPLICABILITY OF A PLANT CANOPY MODEL IN LARGE-EDDY SIMULATION WITH A 0-EQUATION MODEL CONSIDERING ONLY DRAG FORCE TERM FOR PEDESTRIAN WIND ENVIRONMENTS

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  • 抗力項のみを考慮した0 方程式LES で定式化される植生キャノピーモデルの歩行者空間における風環境予測への適用性の検討

Abstract

This study examined the applicability of a plant canopy model in large-eddy simulation (LES) with a 0-equation subgrid scale (SGS) model considering only drag force term for pedestrian wind environment (PWE) by comparing with a 1-equation model reproducing the increase in SGS kinetic energy kSGS within the tree crown. The two simulations for the flows around a two-dimensional row of trees provided in the benchmark case by Architectural Institute of Japan and actual homestead trees were conducted. In the benchmark case, the 1-equation model reproduced similar results to the 0-equation model due to the small increase in kSGS In addition, the 0-equation model still reproduced the results of field observation in an actual homestead trees case. The effect of increasing kSGS on the mean wind speed, grid scale turbulent kinetic energy, and probability density function of wind velocity fluctuation became small under the spatial resolutions generally used for the simulation for PWE.

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