Abstract
To develop a prediction method of instantaneous high concentration in a highly turbulent region nearby buildings, numerical simulations are carried out, The standard k-ε model is employed as a turbulent model. The transport equation for the standard deviation of concentration is calculated as well as the transport equation of concentration. Through the validation, irrespective of the source position, the time-averaged concentration distributions by the numerical simulation agree with the result of the wind tunnel tests will. The reproducibility of the distributions of the standard deviation depend on the source position. For the cases which the standard deviation is reproduced will, an instantaneous high concentration can be predicted from the time-averaged concentration, the standard deviation of the concentration and the probability density function which is obtained in the part one of this study.
