Abstract
In this study, the effects of surface temperature and roughness length of green-park in the urban area on the surface wind was analyzed using a computational fluid dynamics (CFD) model. Three-dimensional configurations and buildings for evaluation on the real urban were numerically constructed based on the geographic information system(GIS) data. The sensitivity experiments with differential heating of the surface temperature in the park area, it is shown that the overall flow pattern was wind direction similar to the inflow(NE). In the upwind area, the wind from the park flowed into the a cluster of building to form a circulating wind and in the downwind area, the flow was separated and the wind speed was decreased because many buildings were concentrated. The changes of roughness length influences a slight effects on the surface wind. In the case of simulation results compared to observations, the wind speed was somewhat overestimated (about +0.07 m/s). It is also suggested that the roughness length and differential heating of surface should be necessary for CFD modeling.
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