A study on investigating on mechanisms and modelling for momentum & scalar transferring brought by complex urban canopy turbulence

2015 Fiscal Year Final Research Report

• Project/Area Number: 25289196
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Architectural environment/Equipment
• Research Institution: Kyushu University
• Principal Investigator: Tanimoto Jun 九州大学, 総合理工学研究科(研究院), 教授 (60227238)
• Co-Investigator(Kenkyū-buntansha): HAGISHIMA Aya 九州大学, 大学院総合理工学研究院, 准教授 (60294980) ; IKEGAYA Naoki 九州大学, 大学院総合理工学研究院, 助教 (70628213)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 都市キャノピー / 運動量・スカラー輸送 / 都市気候 / 風洞模型実験 / CFD / LES / PIV

Outline of Final Research Achievements

To dedicate for elaborating prediction on heat island, urban canyon environment and its thermal comfort, a series of systematic explorations; consisting of wind-tunnel experiments, PIV visualizations, and intrigued CFD approaches have been tackled, which leads to holistic understanding on various complex effects brought by urban canopy turbulence. In practice, we elucidated there is an acting universal scaling law between transferring momentum and transferring scalar significantly affected by the urban-canopy turbulence. By means of PIV technique, we explored how secondary roughness elements like overhangs qualitatively affect on amount of ventilation between inside and above urban canopy. Also, we do with numerical experiments based on LES so as to account the spatial distribution of pressure coefficient on an exterior wall that significantly affects on building ventilation, and to qualitatively evaluate gust risk for walking people in an urban street.

Free Research Field

都市建築環境工学