抄録
The present research introduces a technique to determine the location of pollution sources in urban areas through the use of inverse CFD modeling. The technique depends primarily on the solution of the transport equation with time integration in the negative direction. This is called the Reversed Time Marching Method (RTMM). In order to examine the accuracy of RTMM in identifying pollution sources, two examples were given. In the first one, a simple laminar flow was considered and a pollutant was emitted for variable wind conditions. In the second example, the wind flow around a single building was investigated for two different sources. Steady-state numerical simulations were carried out at first in order to estimate flow fields. Then, forward-time simulation was used to calculate pollutant concentrations. In the last stage, the scalar transport equation was solved again but with a reversed flow field and negative diffusion term. By using peak concentration, one could identify the source of the pollution. Results of the study demonstrated that RTMM can identify pollution sources in urban areas with a satisfactory degree of accuracy. However, more work is needed to decrease the wide spread of the concentration field around source location to facilitates the source identification.
