Numerical Simulation Of Industrial Processes Of Atmospheric Pollutants Diffusion

At present, the most common model simulating contamination diffusion is Gauss Model, but Gauss Model has some disadvantage, so this paper built another mathematical model to simulate contamination diffusing. The following work has been done:1. Air flow in the condition of forcible convection in the confined vacuum has been simulated by solving mass conservation equation, momentum conservation equation and specific values of turbulent flow (k-s) equation simultaneously. And following conclusion has been drawn: Air flowing in the controlled body, especially in the windy region is very sufficient. This kind of air flow field is good at contamination diffusion.2. Concentration field in the condition of forcible convection in the confined vacuum has been calculated by programming flow field and concentration field simultaneously. And following conclusion has been drawn: no matter how many polluting fountains there are in the controlled body and no matter where the polluting fountains locate, the place near every polluting fountains is contamination enrichment region; There are no contamination enrichment region in the windy area.3. Air flow field in the condition of unforced convection in the confined vacuum by calculating subroutine program of flow field and temperature field simultaneously. The following conclusion has been drawn: A large air circle movement has formed because of thermal fountain in the whole controlled body, and there are obvious eddy in some region.4. Unstable concentration field in the condition of unforced convection in the confined vacuum has been calculated by programming flow field and concentration field simultaneously. The following conclusion has been drawn: no matter how many polluting fountains there are in the controlled body and no matter where the polluting fountains locate, the place near every polluting fountains is contamination enrichment region; There is a little contamination apart from the polluting fountain.5. Air flow has been simulated in the opened space when it is windy by solving mass conservation equation, momentum conservation equation and specific values of turbulent flow (k-e) equation simultaneously, and the flowing conclusion has been drawn: Building has much effect on wind field, wind flow disturbed is smaller when vertical distance increase, air flow is affected little when the distance far from the building become longer in the horizontal range, and air flow revert to former flowstate when it is far away from the building for a certain distance.6. Unstable concentration field in the opened space when it is windy has been simulated by programming flow field and concentration field, and the following conclusion has been drawn: The degree of contamination diffusion is low near polluting fountain, and there are obvious contamination enrichment region; polluting fountain diffuse down the direction of the wind; the degree of polluting fountain diffusion is more higher and polluting fountain diffuse more far when vertical distance increase.