Improvement of Building-Construction Algorithm for Using GIS data and Analysis of Flow and Dispersion around Buildings

Kwon, A-Rum; kim, jaejin

doi:10.7780/kjrs.2014.30.6.4

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…이 러한 한계를 극복하기 위하여, 미세 규모의 대기 흐 름 분석이 가능한 전산유체역학(computational fluid dynamics, CFD) 모델이 주로 사용되고 있다 (Kim, 2007;Kim et al, 2012;Kwak et al, 2015). CFD (Baik et al, 2003;Kim and Baik, 2009;Lee and Kim, 2011;Kwon and Kim, 2014). 초창기의 연구들은 주로 단순한 건물 주 변의 흐름이나 도시 협곡이라 불리는 건물과 건물 사 이 공간에서의 흐름이나 확산 현상에 관심을 두었다 (Brown et al, 2001;Baik et al, 2003 (Chu et al, 2005;Neofytou et al, 2008;Zheng et al, 2010;Toparlar et al, 2015 (Macdonald et al, 1998;Britter and Hanna, 2003;Sabatino et al, 2007;Santiago et al, 2007) (1)…”

Section: 서 론unclassified

A Study on the Characteristics of Flows around Building Groups Using a CFD Model

Lee¹,

Kim

Lee³

2015

Atmosphere

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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.

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Section: 서 론unclassified

A Study on the Characteristics of Flows around Building Groups Using a CFD Model

Lee¹,

Kim

Lee³

2015

Atmosphere

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Analysis on the Observation Environment of Surface Wind Using GIS data

Kwon

Kim

2015

Korean Journal of Remote Sensing

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:In this study, the observation environment of surface wind at an automatic weather station (AWS 288) located at Naei-dong, Mirang-si was analyzed using a computational fluid dynamics (CFD) model and geographic information system (GIS). The 16 cases with different inflow directions were considered before and after construction of an apartment complex around the AWS 288. For three inflow directions (south-south-westerly, south-south-easterly, and north-north-westerly), flow characteristics around the AWS 288 were investigated in detail, focusing on the changes in wind speed and direction at the AWS location. There was marked difference in wind speed between before and after construction of the apartment complex in the south-south-westerly case. In the south-south-easterly and north-northwesterly cases which were frequently observed at the AWS 288, the construction of the apartment complex had no marked influence on the observation of surface wind.

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Effects of Differential Heating by Land-Use types on flow and air temperature in an urban area

Park¹,

Choi²,

Kang³

et al. 2016

Korean Journal of Remote Sensing

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:In this study, the effects of differential heating by land-use types on flow and air temperature at an Seoul Automated Synoptic Observing Systems (ASOS) located at Songwol-dong, Jongno-gu, Seoul was analyzed. For this, a computation fluid dynamics (CFD) model was coupled to the local data assimilation and prediction system (LDAPS) for reflecting the local meteorological characteristics at the boundaries of the CFD model domain. Time variation of temperatures on solid surfaces was calculated using observation data at El-Oued, Algeria of which latitude is similar to that of the target area. Considering land-use type and shadow, surface temperatures were prescribed in the LDAPS-CFD coupled model. The LDAPS overestimated wind speeds and underestimated air temperature compared to the observations. However, a coupled LDAPS-CFD model relatively well reproduced the observed wind speeds and air temperature, considering complicated flows and surface temperatures in the urban area. In the morning when the easterly was dominant around the target area, both the LDAPS and coupled LDAPS-CFD model underestimated the observed temperatures at the Seoul ASOS. This is because the Kyunghee Palace located at the upwind region was composed of green area and its surface temperature was relatively low. However, in the afternoon when the southeasterly was dominant, the LDAPS still underestimated, on the while, the coupled LDAPS-CFD model well reproduced the observed temperatures at the Seoul ASOS by considering the building-surface heating.

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Improvement of Building-Construction Algorithm for Using GIS data and Analysis of Flow and Dispersion around Buildings

Cited by 3 publications

References 22 publications

A Study on the Characteristics of Flows around Building Groups Using a CFD Model

A Study on the Characteristics of Flows around Building Groups Using a CFD Model

Analysis on the Observation Environment of Surface Wind Using GIS data

Effects of Differential Heating by Land-Use types on flow and air temperature in an urban area

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