Full scale experiment of gas dispersion in an urban area and its prediction by wind tunnel experiment and large eddy simulation

Part2 Comparison of wind velocity and gas concentration between wind tunnel experiment and field measurement

Abstract

The wind tunnel experiment was carried out under the condition of field measurements. In the experiments, an approach flow of the category surface roughness IV was adopted. Three wind directions were selected based on the condition of field measurements. A high speed total hydrocabon analayzer and three type of split film probe were used for measurements of concentration and wind speed, respectively. The normalized non-dimensional concentration and the wind speed ratio obtained by the wind tunnel experiments agreed well with the field measurement data. It is found that the variance of wind direction effect on the distribution of concentration and wind characteristics.