九州大学 · 環境科学
C. Hirose教授の研究室では、都市環境下における自然換気のメカニズムや、メタンバブルの上昇挙動を数値シミュレーションと実験的観察を融合して解明しています。特に、周囲の建物配置が換気効率に与える影響や、メタンハイドレートを形成したバブルの動的挙動の解析が主な研究テーマです。都市部の風環境の最適化や、地球温暖化に寄与するメタンの放出メカニズムの解明を目指しています。
Figures are computed from collected data and may differ slightly.
Abstract In this study, the velocity field in a naturally ventilated building within an urban‐like array was explored using large‐eddy simulations. Reduced‐scale building models were used to examine the impacts of the geometric conditions in the surrounding buildings and cross‐ventilating windows on the flow statistics and instantaneous velocity fields in the sheltered building. The instantaneous velocity components averaged in the opening area were calculated for each condition of the building
The velocity field in a naturally ventilated building within urban-like arrays was explored by means of large-eddy simulations. The reduced-scale building models were utilized to examine the impact of the geometric conditions in surrounding buildings and cross-ventilating windows on flow statistics as well as instantaneous velocity fields in a sheltered building. The obtained results indicated how the incoming flow was propagated in the target building. Although simplified conditions were employ
In this study, we conducted a quantitative analysis of the behavior of ascending methane bubbles, which were filmed at two natural gas seep sites and reproduced by numerical simulations using two-dimensional motion analysis software. The targeted sites were located in the southwest and northeast of Sado Island at the eastern margin of the Sea of Japan, where methane bubbles with and without a methane hydrate (MH) layer were observed, respectively. The simulations comprising gas bubbles and MH bu
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