CFD ANALYSIS OF FLOW AND CONCENTRATION FIELDS AROUND A BUILDING WITH A ROOF STACK

The prediction of plume dispersion near buildings is very important for the design of exhaust stacks andair intakes in order to avoid adverse air quality impacts. However, it is difficult to predict pollutantdispersion with certain accuracy due to the complex interaction between atmospheric flow and flowaround buildings. Although Computational Fluid Dynamics (CFD) techniques are widely utilized tostudy the wind field and pollutant transport near and around buildings through rapid development incomputer hardware and numerical modeling, the prediction accuracy of the quantitative values forthese phenomena is not so clear.In this paper, the prediction accuracy of the flow and dispersion around a cubic building with aflush stack located on the roof were examined using various k-? models. Numerical results werecompared with the wind tunnel data. The pollutant distributions were well predicted with the modifiedk-? models. It was confirmed that the predicted concentrations by all CFD models were less diffusivethan those of the experiment and the results were largely dependent on the value of turbulent Schmidtnumber.