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- W2261799076 abstract "Computational Fluid Dynamics (CFD) is increasingly used to predict the wind flow and pollutant dispersion around buildings. One of the most frequently used turbulence approaches in CFD is given by the Reynolds-averaged Navier-Stokes (RANS) equations. In this research, prediction of pollutant dispersion around buildings was compared with windtunnel data for two model configurations: an isolated cubic building with a vent located on its rooftop (Case 1) and an actual urban area of Niigata city, Japan (Case 2). This analysis was made through both the wind flow and pollutant concentration field by using RANS. For Case 1, three turbulence models were tested: the Renormalization group (RNG) k-e model, the Realizable k-e model and the Reynolds stress model (RSM). Such models provided underpredicted results in relation to the wind-tunnel data from Li and Meroney (1983). Paying special attention to the recirculation on the rooftop, decreasing the turbulent kinetic energy (k) up to four times, results in a closer correspondence to the experiments. Only the Realizable k-e model failed to reproduce significant recirculation of the wind flow on the rooftop. The RNG k-e model and RSM presented fair results against measurements. Case 2 presents a higher level of complexity than Case 1 because it treats an urban area which is characterized by irregular buildings and streets. Thus, it is more difficult to arrange a high-quality grid. A high-quality grid was created with a total number of cells higher than 60 million. One simulation was performed by using RANS. Results were validated using the wind-tunnel data provided by the Architectural Institute of Japan (AIJ). The wind flow field predictions showed good agreement. Concentration field predictions showed overpredicted results in some locations, however, in general, the results showed fair agreement with the wind-tunnel measurements." @default.
- W2261799076 created "2016-06-24" @default.
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- W2261799076 date "2014-01-01" @default.
- W2261799076 modified "2023-09-27" @default.
- W2261799076 title "Numerical analysis and experimental validation of pollutant dispersion for the actual urban area of Niigata city, Japan" @default.
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