Influence of Turbulent Inflow with Different Generation Method on Diffusion Field in Urban Street Canyon

Abstract

The authors conducted LES analysis of the flow field in the city block model using three kinds of incoming fluctuating winds with different creation methods as previously reported and compared with the wind tunnel experiment result. As a result, in the place surrounded by the building, the flow field was hardly dependent on the way of creating the influent wind. In this report, we investigated the influence of the method of creating inflow fluctuating wind on the diffusion field using the same city block model. As a result, it is considered that influence on the diffusion field is small in the place disturbed by the block, the way of creating the inflow fluctuating wind is small. So far, we have compared statistical values and so on. In the future we will study the reason why the time mean value of dimensionless concentration is different and the reason why the standard deviation of the wind tunnel experiment is lower than the LES analysis by the wind tunnel experiment and the LES analysis by using spectral analysis and the like.