Publication: Estudio experimental y numérico del flujo oscilatorio alrededor de dos cilindros
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Publication date
2013-06
Defense date
2013-07-10
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Abstract
En el presente proyecto, se analiza el flujo oscilatorio alrededor de dos cilindros. Partiendo de
las bases matemáticas planteadas por Coenen y Riley (2009), director de este proyecto, se
estudia el efecto steady streaming inducido por el movimiento de las paredes sólidas de los
cilindros. Se pretende validar sus teorías mediante experimentos en el laboratorio del
Departamento de Ingeniería Térmica y de Fluidos de la Universidad Carlos III de Madrid así
como mediante simulaciones por ordenador.
Se ha observado la aparición de dos puntos de remanso y dos puntos de eyección en cada
cilindro, así como, la formación de chorros que emergen desde estos puntos de eyección,
formándose, a su vez, un patrón de zonas de recirculación alrededor de los cilindros.
El equipo experimental utilizado se compone de un tanque con agua mezclada con partículas
de vidrío, un láser y una cámara conectada a un ordenador. Se han captado imágenes de la
evolución del flujo que después han sido procesadas mediante Matlab. Así, se han obtenido las
sendas de las partículas de vidrio, los campos de vectores de velocidad e isolíenas de
velocidad.
Las simulaciones computacionales se han llevado a cabo mediante dos programas de CFD
(Computational Fluid Dynamics), Fluent y Gerris. Para ello, se ha creado la geometría a estudiar
y se ha generado un mallado de esa geometría. Después, se ha simulado el flujo obteniéndose
las sendas correspondientes. Estos resultados se han comparado con los obtenidos
experimentalmente.
Se concluye que las teorías de Coenen y Riley (2009) son ciertas a excepción de la hipótesis
sobre la dirección del chorro formado.
In this project, the oscillatory flow around two cylinders has been analyzed. The steady streaming phenomenon induced by the movement of solid walls of the cylinders has been studied, using as a starting pint the mathematical work from Coenen y Riley (2009), tutor of this project. The purpose of the present work is to validate their theory recreating the problem in the laboratory of the Thermal and Fluid Department of the University Carlos III de Madrid, and also, using computational fluid dynamics software. The appearance of two points of attachment and two points of ejection has been observed, as well as the emergence of jets. These jets create a pattern of recirculation zones around the cylinders. The experimental equipment consisted in a tank of water mixed with glass particles, a laser and a camera connected to a computer. Images of the evolution of the flow were taken and later were processed with Matlab. Thereby, streak lines and velocity flow fields were obtained. The computer simulations were performed with the CFD (Computational Fluid Dynamics) codes Fluent and Gerris. For this, it has been necessary to create the studied geometry and to generate a mesh for this geometry. Then, the flow was solved numerically and the streak lines have been obtained. All the results have been compared with the ones obtained experimentally. It can be concluded that all the theory raised by Coenen y Riley (2009) has been found in agreement with the experimental and numerical results of this work, except for the exact direction of the jets.
In this project, the oscillatory flow around two cylinders has been analyzed. The steady streaming phenomenon induced by the movement of solid walls of the cylinders has been studied, using as a starting pint the mathematical work from Coenen y Riley (2009), tutor of this project. The purpose of the present work is to validate their theory recreating the problem in the laboratory of the Thermal and Fluid Department of the University Carlos III de Madrid, and also, using computational fluid dynamics software. The appearance of two points of attachment and two points of ejection has been observed, as well as the emergence of jets. These jets create a pattern of recirculation zones around the cylinders. The experimental equipment consisted in a tank of water mixed with glass particles, a laser and a camera connected to a computer. Images of the evolution of the flow were taken and later were processed with Matlab. Thereby, streak lines and velocity flow fields were obtained. The computer simulations were performed with the CFD (Computational Fluid Dynamics) codes Fluent and Gerris. For this, it has been necessary to create the studied geometry and to generate a mesh for this geometry. Then, the flow was solved numerically and the streak lines have been obtained. All the results have been compared with the ones obtained experimentally. It can be concluded that all the theory raised by Coenen y Riley (2009) has been found in agreement with the experimental and numerical results of this work, except for the exact direction of the jets.
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Keywords
Dinámica de fluidos, Flujo oscilatorio, Simulación por ordenador, Cilindros