In this work, the vortex system around an isolated prismatic rectangular building was studied using smoke injection technique. This vortex system can be one of the causes of air quality problems, such as dangerous contaminants released in the near wake of the building in chemical-plants. Two models scale building with different aspect ratios were used in an atmospheric boundary wind tunnel. The qualitative analyses of video recorded images of smoke flow and laser light illumination provided a good view of the complex wind flow around an isolated building. RESUMO Neste trabalho, foi realizado um estudo do sistema de vórtices nas vizinhanças de um obstáculo retangular prismático utilizando a técnica de injeção direta de fumaça. Este sistema de vórtices pode causar sérios problemas de qualidade do ar, por exemplo, quando ocorre o lançamento de contaminantes perigosos na região de esteira próxima a edifícios situados em plantas químicas. Análises qualitativas dos registros das imagens forneceram uma boa visão do complexo campo de escoamento do vento nas vizinhanças do obstáculo.
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