Paper Conference

Proceedings of ASim Conference 2014: 2nd Asia conference of IBPSA-China, Japan, Korea


Large-Eddy Simulation on the gust probability in urban pedestrian spaces

Yasuaki Ikeda, Aya Hagishima, Naoki Ikegaya, Jun Tanimoto

Abstract: Large-eddy simulation (LES) on the airflow in pedestrian spaces of cubic block canopy is performed to investigate the influence of gust events on urban pedestrian safety. The authors analyzed spatio-temporal fluctuation of wind speed recorded with the frequency of 1Hz for 4000 seconds, and examined convergence of turbulence statistics to find the appropriate solution under the trade off of limited data storage and the accuracy of statistics. In addition, the duration of the gust events in pedestrian spaces is investigated. Based on them, it is revealed that 1) convergence of kurtosis can be a parameter to estimate statistically steady state in the analysis of gust events, and that 2) the difference of wind speed between 1st and 5th percentile is around 24 %; thus, determining criteria based on the percentile should be carefully done.
Keywords: Pedestrian wind environment, Gust, Statistical analysis
Pages: 276 - 283