Flow Characteristics Around Step-Up Street Canyons with Various Building Aspect Ratios

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dc.contributor.author Park, Soo-Jin ko
dc.contributor.author Kim, Jae-Jin ko
dc.contributor.author Choi, Wonsik ko
dc.contributor.author Kim, Eun-Ryoung ko
dc.contributor.author Song, Chang-Keun ko
dc.contributor.author Pardyjak, Eric R. ko
dc.date.available 2020-02-13T08:41:20Z -
dc.date.created 2020-02-06 ko
dc.date.issued 2020-03 ko
dc.identifier.citation BOUNDARY-LAYER METEOROLOGY, v.174, no.3, pp.411 - 431 ko
dc.identifier.issn 0006-8314 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/31138 -
dc.description.abstract We investigate the flow characteristics around step-up street canyons with various building aspect ratios (ratio of along-canyon building length to street-canyon width, and upwind building height to downwind building height) using a computational fluid dynamics (CFD) model. Simulated results are validated against experimental wind-tunnel results, with the CFD simulations conducted under the same building configurations as those in the wind-tunnel experiments. The CFD model reproduces the measured in-canyon vortex, rooftop recirculation zone above the downwind building, and stagnation point position reasonably well. We analyze the flow characteristics, focusing on the structural change of the in-canyon flows and the interaction between the in- and around-canyon flows with the increase of building-length ratio. The in-canyon flows undergo development and mature stages as the building-length ratio increases. In the development stage (i.e., small building-length ratios), the position of the primary vortex wanders, and the incoming flow closely follows both the upstream and downstream building sidewalls. As a result, increasing momentum transfer from the upper layer contributes to a momentum increase in the in-canyon region, and the vorticity in the in-canyon region also increases. In the mature stage (i.e., large building-length ratios), the primary vortex stabilizes in position, and the incoming flow no longer follows the building sidewalls. This causes momentum loss through the street-canyon lateral boundaries. As the building-length ratio increases, momentum transfer from the upper layer slightly decreases, and the reverse flow, updraft, and streamwise flow in the in-canyon region also slightly decrease, resulting in vorticity reduction. ko
dc.language 영어 ko
dc.publisher Kluwer Academic Publishers ko
dc.title Flow Characteristics Around Step-Up Street Canyons with Various Building Aspect Ratios ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85076903823 ko
dc.identifier.wosid 000514801200004 ko
dc.type.rims ART ko
dc.identifier.doi 10.1007/s10546-019-00494-9 ko
dc.identifier.url https://link.springer.com/article/10.1007/s10546-019-00494-9 ko
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