Zúñiga, Santiago L. (2018) Simulación de alta resolución de turbulencia no estacionaria. / High resolution simulations of unsteady turbulence. Maestría en Ingeniería, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
El flujo combinado consiste de un flujo oscilatorio superpuesto sobre una corriente constante. En este trabajo se estudia flujo combinado en la cercanía de una pared rígida mediante simulación numérica directa (DNS, por Direct Numerical Simulation) de las ecuaciones de Navier-Stokes. Este tipo de flujos se presenta, por ejemplo, en ambientes costeros donde corrientes marinas se superponen a las olas, flujo de sangre, álabes de turbomáquinas, o flujo cruzado entre subcanales de elementos combustibles nucleares. Las simulaciones se realizaron para un número de Reynolds basado en la frecuencia y amplitud de oscilación de 4:95E5 en régimen de transición turbulento y la relación entre la magnitud del gradiente de presión constante y oscilatorio que fuerza el fluido se varió entre valores de 0:005 y 0:2. Estos parámetros corresponden al régimen dominado por las oscilaciones, con frecuencias bajas. El trabajo se focaliza en el análisis de las velocidades medias, las tensiones de corte totales, la energía cinética turbulenta y las componentes de la ecuación de balance de la misma. Los resultados obtenidos demuestran que para el caso con mayor componente de correntada el comportamiento corresponde a un flujo cuasiestacionario cuyas propiedades no dependen del avance temporal si se utiliza la escala correspondiente para cada momento de tiempo. Por su parte para los casos dominados por la oscilación se muestra que, para las amplitud seleccionadas, el comportamiento es similar al correspondiente a una oscilación pura con diferencias menores. En los casos de transición el comportamiento se asemeja al estacionario para fases lejos de los mínimos del corte en la pared.
Resumen en inglés
Combined flow is the superposition of a oscillatory flow and a stationary current. In the present work the turbulent boundary combined flow is studied, using direct numerical simulations (DNS) of the Navier-Stokes equations. These type of flows are relevant in coastal regions where waves are in the presence of maritime currents, blood flow, turbomachines blades or cross flow between subchannels of nuclear fuel elements. Simulations were performed using a wave Reynolds number, based on the amplitude and frequency of oscillation, of 4:95E5 in the transition to fully turbulent regime. The ratio between the current pressure gradient and the amplitude of oscillatory gradient used in the simulations spans between 0:005 and 0:2 corresponding to the low frequency wave-dominated regime. The present work is focused on the study of mean velocities, total shear stress, turbulent kinetic energy (TKE) and the TKE budget. It is found that for the case with the greatest current component the flow behaviour follows a quasistationary regime, for which properties do not show a temporal dependence as long as the correct instantaneus scales are used. For the wave dominated cases it is shown that the flow behaviour follows closely the wave case with minor differences. For transitional cases and for phases away from the minimum shear stress the flow behaviour follows the current dominated one.
| Tipo de objeto: | Tesis (Maestría en Ingeniería) |
|---|---|
| Palabras Clave: | Turbulence flow; Flujo turbulento; [Unsteady turbulence; Turbulencia no estacionaria; Turbulent oscillatory flow; Flujo turbulento oscilatorio; Channel flow; Flujo de canal; Direct numerical simulation; Simulación numérica directa; Turbulent kinetic energy; Energía cinética turbulenta] |
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| Materias: | Ingeniería nuclear > Mecánica de fluidos |
| Divisiones: | Aplicaciones de la energía nuclear > Tecnología de materiales y dispositivos > Mecánica computacional |
| Código ID: | 776 |
| Depositado Por: | Tamara Cárcamo |
| Depositado En: | 24 Jun 2019 13:46 |
| Última Modificación: | 24 Jun 2019 13:46 |
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