Numerical modeling study to compare the nutrient removal potential of different floating treatment island configurations in a stormwater pond The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation Xavier, Manoel Lucas Machado et al. "Numerical modeling study to compare the nutrient removal potential of different floating treatment island configurations in a stormwater pond." Ecological Engineering 111 (February 2018
Island topographies to reduce short-circuiting in stormwater detention ponds and treatment wetlands The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation Balderas-Guzman, Celina et al. "Island topographies to reduce short-circuiting in stormwater detention ponds and treatment wetlands."
The influence of inlet momentum and inlet orientation on hydraulic performance of cylindrical water process tanks were investigated using a factorial design strategy. The hydraulic performance of the tanks was assessed with a computational fluid dynamics (CFD) model, which calculated the flow fields and the residence time distribution (RTD). RTDs were used to quantify the tanks hydraulic performance using hydraulic indexes that represent short-circuiting, mixing, and moment. These indexes were later associated with the effluent fraction of disinfectant (inlet and outlet disinfectant ratio). For small depth-to-diameter ratios, the inlet orientation and the inlet momentum were the most important factors regarding the hydraulic indexes and the effluent fraction of disinfectant, respectively. A poor correlation was obtained between the hydraulic indexes and the effluent fraction of disinfectant, indicating that they are not good predictors for water quality. For large depth-to-diameter ratios, the inlet orientation had the most significant effect on both the hydraulic indexes and effluent fraction of disinfectant. The short-circuiting and mixing indexes presented a good correlation with water quality for this case. Dimensionless time necessary for 10 % of the tracer to leave the system
Keywords Numerical simulations Á Computational fluid dynamics (CFD) Á Residence time distribution (RTD) Á Water quality Á Factorial design
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RESUMO O objetivo deste trabalho foi apresentar, por meio da técnica dinâmica dos fluidos computacional (CFD), dois métodos utilizados nas representações conceitual e física da vegetação em meio aquático: meio poroso e elementos geométricos simplificados. Três estudos de caso, que incluem um wetland flutuante e manchas de vegetação, exemplificam a aplicação dos métodos, mostrando suas vantagens e desvantagens. Nas etapas da geometria e da malha, a representação da vegetação como meio poroso é mais simples, prática e rápida do que a da vegetação como elementos geométricos simplificados. Porém, na parte da modelagem das equações, o método do meio poroso não consegue capturar os processos de mistura no interior da vegetação, enquanto o método dos elementos geométricos simplificados consegue.
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