Kyushu University · Environmental Science
Professor C. Hirose's research lab specializes in fluid dynamics and environmental fluid mechanics, focusing on urban wind environments and natural ventilation in buildings. The lab employs large-eddy simulations and experimental analysis to investigate how urban morphology and building geometry influence indoor and outdoor airflow, particularly in cross-ventilated spaces. A key research direction involves the behavior of gas bubbles in aquatic environments, especially methane bubbles and their interaction with methane hydrates, using both field observations and numerical modeling. The lab's work bridges environmental science, fluid dynamics, and urban planning to improve sustainable building design and understand natural gas seepage processes.
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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