Disaster estimation of wind gust considering turbulence structure and uncertainty of peak wind velocity in urban boundary layer for extreme weather event

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K14869
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: Ochanomizu University
• Principal Investigator: Kawai Hidenori お茶の水女子大学, 基幹研究院, 准教授 (00735376)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 極端気象 / 数値流体解析 / ピーク風速 / 気象モデル

Outline of Final Research Achievements

Based on the meteorological field obtained by the meteorological model, numerical simulation of broad urban area was carried out to make inflow conditions for estimating peak wind speeds inside and outside the urban canopy and wind pressure on buildings, and to clarify the variability of these conditions. Then, peak wind speed estimation was also carried out for several block group cases with heterogeneous roughness condition to clarify the factors causing peak wind speeds inside and outside the urban canopy, focusing on the characteristics of the turbulent structure inside and outside the urban canopy.
Next, the effect of uncertainties in inflow conditions on the wind pressure distribution in three-dimensional square cylinder was also shown from analysis cases of three-dimensional square cylinder based on multiple inflow condition.

Free Research Field

風工学

Academic Significance and Societal Importance of the Research Achievements

本課題では「空間フィルタリング・リスケーリング手法」により気象モデルと工学LESモデルの接続を試みることにより，それぞれの分野で示された乱流構造の横断的な理解を試みると同時にピーク風速と乱流構造の特徴の関係を示したといえる。また，本研究で得られた風圧力のばらつきについては，多項式カオス展開などの不確定性定量化（UQ）手法を適用することで外装材の風圧力のばらつきの要因を明らかにし，将来的には設計値の理論的・客観的な根拠を示す資料として提示されることが期待される。