This works aims at numerically investigating the flow around a group of four non-aligned cylinders, for two different angles of incidence, β = 0° and 180° at Reynolds number (Re) equal to 200. The influence of the proximity between the cylinders is investigated by means of the numerical analysis based on Computational Fluid Dynamics (CFD), using a finite volume method with two-dimensional unstructured meshes. The distance between cylinders and the angle of incidence has a great influence on the flow behavior, which is reflected on the analysis of the force coefficients and the Strouhal number. At β = 0°, it is observed the presence of two regimes in the time series of the lift coefficient, which lifespan of the first regime is reduced with increase of the spacing ratio. Also, different drag coefficients were seen at spacing ratio equals to 3.5 D for the rear cylinders. Regarding to the results with β = 180°, they showed multiple peaks on the lift coefficient amplitude spectrum for the rear cylinders. This work contributes to enhance the understanding of the flow around multiple cylinders, mainly regarding non-traditional configurations such as tandem and side-by-side arrangements.
ResumoO escoamento ao redor de múltiplos cilindros é um problema encontrado em diversas aplicações tecnológicas como em colunas de plataformas o shore, chaminés industriais e edifícios. Ainda que seja bastante recorrente, é um problema bastante complexo devido ao surgimento do fenômeno de interferência. Tal fenômeno, provocado pela presença de dois ou mais corpos em proximidade, é regido pela variação de diversos parâmetros como a configuração geométrica, a quantidade de cilindros presentes no arranjo, o número de Reynolds e o ângulo de incidência do escoamento. Diversas pesquisas sobre o tema têm sido realizadas com o objetivo de melhor entender o problema. É nesse contexto que se insere o presente trabalho, com a perspectiva de contribuir para o desenvolvimento do assunto, focando no estudo do campo de escoamento ao redor de um agrupamento de quatro cilindros não alinhados, para dois diferentes ângulo de incidência, -= 0 ¶ e 180 ¶ . A influência da proximidade entre os cilindros é investigada por meio de uma análise numérica baseada na fluidodinâmica computacional (CFD), em particular o método dos volumes finitos. As simulações têm caráter bidimensional, sendo o escoamento caracterizado pelo número de Reynolds (Re) igual a 200. As análises dos padrões de escoamento, bem como das forças fluidodinâmicas e do número de Strouhal mostram a relação entre a proximidade entre cilindros e o fenômeno de interferência sobre o escoamento.Palavras-chave: Fenômeno de interferência, Fluidodinâmica computacional, Escoamento ao redor de múltiplos cilindros. AbstractThe flow around multiple cylinders is a problem found in a number of technological applications such as in columns of o shore platforms, industrial chimneys and buildings. Although recurrent, it is a very complex problem due to the appearance of the interference phenomenon. Such phenomenon, caused by the presence of two or more bodies in proximity, is governed by variation in several parameters such as the geometric configuration, number of cylinders present in the arrangement, Reynolds number and angle of incidence of the flow. Several pieces of research on the subject were carried at aiming at the improvement of the understanding of the problem. It is in this context that the present work is presented, with the perspective of contributing to the development of the subject, focusing on the study of the flow around a group of four non-aligned cylinders, for two di erent angles of incidence, -= 0 ¶ and 180 ¶ . The influence of the proximity between the cylinders is investigated by means of numerical analysis based on computational fluid dynamics (CFD), particularly the finite volume method. The simulations are two-dimensional and the Reynolds number (Re) is equal to 200. The analyzes of the flow patterns, as well as the fluid dynamics forces and the Strouhal number show the relationship between the proximity between cylinders and the phenomenon of interference on the flow.Em inglês, blu -body. Corpo que quando imerso em uma corrente de fluido, gera a separação do esco...
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