Development of numerical method and wind tunnel experiment to evaluate flying behavior and impact force of wind-borne debris

2021 Fiscal Year Final Research Report

• Project/Area Number: 18H01527
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 22020:Structure engineering and earthquake engineering-related
• Research Institution: Nihon University
• Principal Investigator: NOMURA Takashi 日本大学, 理工学部, 特任教授 (50126281)
• Co-Investigator(Kenkyū-buntansha): 吉田 昭仁 東京工芸大学, 工学部, 教授 (90329219)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Keywords: 風災害 / 飛来物 / 衝撃力 / 数値流体解析 / 風洞実験

Outline of Final Research Achievements

In wind-induced disasters, flying debris cause serious damages in addition to direct forces of wind. The present study had promoted to develop a numerical fluid-structure interaction method as well as a wind tunnel experimental method to evaluate impact forces of flying debris. In order to take into account the dynamic fluid forces of a rotating arbitrary configuration of flying object and long flight path, the numerical domain travels with the flying object. The numerical domain contains a spherical interior domain which rotates with the flying object. The interface condition between the interior and exterior domains has been investigated. A numerical algorithm to evaluate impact force by the object has also been developed. In the wind tunnel experimental method, a strategy to measure impact forces has been developed.

Free Research Field

風工学 計算力学 土木工学

Academic Significance and Societal Importance of the Research Achievements

本研究で開発することを目的とした解析手法は，さらに改良をすべきところはあるが，この方法はその学術的・社会的意義として，風災害の低減に関わる次のような活用が期待される。(1) 竜巻，突風などの小規模な気象現象では災害発生時の風速が分からないことが多いが，被災地における飛来物の飛翔状況を推定することにより風速の推定が可能になる。(2) 被災地で見つかった飛来物の衝撃力を推定することにより，家屋や構造物の衝撃力に対する安全対策に有用な知見が得られる。