| Year of Publication | 2015 | Division | Applied Meteorology Research Division |
|---|---|---|---|
| Title | A Study on the characteristics of flows around building groups using a CFD Model | ||
| Author | 이한경 | ||
| Coauthor | 이영곤 | ||
| ISBN(ISSN) | Name of Journal | 한국기상학회 대기지 | |
| Category (International/Domestic) | 국내 | Vol. No. | 25(3) |
| Research Project Title | 차세대 도시농림융합스마트기상서비스개발 (2015년) | Publication Date | 2015-09-01 |
| Keywords | CFD model, GIS data, flow characteristics, building groups, parameterization method | ||
In this study, the characteristics of flows around building groups are investigated using
a computational fluid dynamics (CFD) model. For this, building groups with different
volumetric ratios in a fixed area are considered. As the volumetric ratio of the building
group increases, the region affected by the building group is widened. However, the
wind-speed reduced area rather decreases with the volumetric ratio near the ground
bottom (z ? 0.7H, here, H is the height of the building group) and, above 0.7H, it increases.
As the volumetric ratio decreases (that is, space between buildings was widened), the
size of recirculation region decreases but flow recovery is delayed, resulting in the
wider wind-speed reduced area. The increase in the volumetric ratio results in larger
drag force on the flow above the roof level, consequently reducing wind speed above
the roof level. However, above z ? 1.7H, wind speed increases with the volumetric ratio
for satisfying mass conservation, resultantly increasing turbulent kinetic energy there.
Inside the building groups, wind speed decreased with the volumetric ratio and averaged
wind speed is parameterized in terms of the volumetric ratio and background flow speed.
The parameterization method is applied to producing averaged wind speed for 80 urban
areas in 7 cities in Korea, showing relatively good performance
a computational fluid dynamics (CFD) model. For this, building groups with different
volumetric ratios in a fixed area are considered. As the volumetric ratio of the building
group increases, the region affected by the building group is widened. However, the
wind-speed reduced area rather decreases with the volumetric ratio near the ground
bottom (z ? 0.7H, here, H is the height of the building group) and, above 0.7H, it increases.
As the volumetric ratio decreases (that is, space between buildings was widened), the
size of recirculation region decreases but flow recovery is delayed, resulting in the
wider wind-speed reduced area. The increase in the volumetric ratio results in larger
drag force on the flow above the roof level, consequently reducing wind speed above
the roof level. However, above z ? 1.7H, wind speed increases with the volumetric ratio
for satisfying mass conservation, resultantly increasing turbulent kinetic energy there.
Inside the building groups, wind speed decreased with the volumetric ratio and averaged
wind speed is parameterized in terms of the volumetric ratio and background flow speed.
The parameterization method is applied to producing averaged wind speed for 80 urban
areas in 7 cities in Korea, showing relatively good performance
