Comparison of Atmospheric Dispersion in a Large Terrain of Kaiga Atomic Power Plant with Simple Terrain Assumption against actual Complex Terrain Modelling

Pollutant dispersion in the atmosphere is an important area wherein different approaches are followed in development of good analytical model. The analysis based on Computational Fluid Dynamics (CFD) codes of fer an opportunity of model development based on fIrst principles of physics and hence such models have an edge over the existing models. The present paper is aimed at bringing out some of the distinct merits and demerits of the CFD based models. A brief account of the applications of such CFD codes reported in literature is also presented in the paper. The choice of codes and the features to be employed from within the code for a specifIc problem needs expertise in thermal-hydraulics and numerical techniques. Brief guidelines towards this objective are also covered in the paper. An illustration of use of CFD code for pollutant dispersion studies is also included in the paper which clearly brings out the success and advantage of CFD based approach for modelling complex terrain.