著者

大風 翼 菊本 英紀 小野 浩己 今野 雅 池谷 直樹 挾間 貴雅 中尾 圭佑 岸田 岳士 田畑 侑一 中島 慶悟 義江 龍一郎 富永 禎秀

出版者

一般社団法人 日本建築学会

雑誌

日本建築学会技術報告集 (ISSN:13419463)

巻号頁・発行日

vol.26, no.62, pp.179-184, 2020-02-20 (Released:2020-02-20)

参考文献数

20

被引用文献数

6

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Appropriate large-eddy simulation (LES) guidelines for pedestrian wind environments are being established by the working group of the Architectural Institute of Japan. We conducted LESs for a flow field around an isolated building to clarify the influence of computational conditions on turbulent statistics. We performed a cross-comparison study by examining both experimental and LES results for various computational conditions such as grid arrangements, subgrid scale models, spatial derivation schemes for convection term, and convergence criterion for a coupling algorithm of flow and pressure fields. Results can be used to provide LES guidelines for predicting the pedestrian wind environment.

著者

中島 慶悟 大岡 龍三 菊本 英紀

出版者

一般社団法人 日本風工学会

雑誌

日本風工学会論文集 (ISSN:13493507)

巻号頁・発行日

vol.42, no.1, pp.9-21, 2017-01-31 (Released:2017-05-15)

参考文献数

18

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Computational fluid dynamics (CFD) analysis using large-eddy simulation (LES) and standard k-ε model (k-ε) was conducted for flow within and above urban canyon under various conditions of thermal stratification. The results of LES and k-ε were compared with the wind tunnel experiment to investigate the prediction accuracy of CFD analysis. k-ε failed to reproduce the spatial distribution of the mean wind velocity vector and mean temperature within the urban canyon compared with LES in unstable case. k-ε underestimated the Reynolds stress <u1’u3’> and turbulent heat flux <u3’T’> within the urban canyon in unstable case. It is thought that the prediction accuracy of k-ε decreases because k-ε underestimates the exchange of momentum and heat within and above the urban canyon compared with LES and the wind tunnel experiment.