Hybrid Analysis of Meso-meteorological Model and Les for Strong Wind in Dense Tall Buildings

This paper provides an appropriate method for predicting strong winds acting on tall buildings erected in close proximity to one another at the center of a city. We first check the accuracy of strong winds estimated using the meso-meteorological model (MM5) without an urban-canopy model above and inside an urban canopy, in comparison with the observational data taken at the rooftop of a high-rise building. With regard to the predictive accuracy by MM5 for urban winds, dependency on characteristics and circumstances of a meteorological event such as cyclogenesis or typhoon has been investigated. Also, we show that the MM5 has a limit to estimate the effects of various surface roughness condition on urban flows. Finally, we clarify the effectiveness of the hybrid analysis of the meso-meteorological model and LES to predict strong winds near the ground level of a city.