中濱 慎司*1・加藤 信介*2・山田 常圭*2・坂本 成弘*3・道越 真太郎*1・森川 泰成*4


キーワード:  トンネル火災,煙流動,ラージ・エディ シミュレーション

*1 技術センター 建築技術研究所 防災研究室
*2 東京大学
*3 技術センター 建築技術開発部 ニューフロンティア技術開発室
*4 技術センター 建築技術研究所

Large Eddy Simulation of Smoke Flow in a Full-scale Tunnel Fire Experiment

Shinji NAKAHAMA*1, Shinsuke KATO*2, Tokiyoshi YAMADA*2, Shigehiro SAKAMOTO*3, Shintaro MICHIKOSHI*1 and Yasushige MORIKAWA*4

This study analyzed smoke flow in a full-scale tunnel fire experiment using Large Eddy Simulation (LES). The study was done to 1) evaluate the accuracy of predicted smoke flows and 2) clarify the characteristics of smoke flowing from a fire’s origin to areas downstream of the tunnel. The latter was accomplished by changing various parameters, such as velocity (with and without) and the scale of the heat release rate. The results of the study are as follows.
(1) The standard distributions of difference between the values from the experiment and those from the analysis were calculated in order to understand the influence of the mesh size on the analysis results. The standard distribution was small for case 3, which used a mesh size close to 0.1 m near the fire origin.
(2) The temperature and velocity data from the experiment and the analysis were compared using LES, and the accuracy of the analysis’ prediction was evaluated. LES was able to reproduce the same smoke flow conditions observed in the experiment, such as the two-layer flow and the temperature gradient under air ventilation.

Keywords:  tunnel fire, smoke flow, Large Eddy Simulation

*1 Disaster Prevention Research Section, Building Engineering Research Institute, Technology Center
*2 The University of Tokyo
*3 Advanced Technology Development Section, Building Technology Development Department, Technology Center
*4 Building Engineering Research Institute, Technology Center