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Numerical analysis of the vortex breakdown phenomenon in conical-cylindrical cavities

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.710
pages 660-671

D. A. M. Martins
School of Mechanical Engineering, Federal University of Uberlandia, Av. Joao Naves de Avila, 2121 Uberlandia, MG, Brazil

F. J. Souza
School of Mechanical Engineering, Federal University of Uberlandia, Av. Joao Naves de Avila 2121, Campus Santa Monica, 38408100 Uberlandia, Minas Gerais, Brasil

R. V. Salvo
School of Mechanical Engineering, Federal University of Uberlandia, Av. Joao Naves de Avila, 2121 Uberlandia, MG, Brazil

Aristeu da Silveira Neto
School of Mechanical Engineering, Federal University of Uberlandia, Av. Joao Naves de Avila, 2121, Uberlandia, Minas Gerais, Brazil

Sinopsis

Numerical simulations in confined rotating flows were performed in this work, in order to verify and characterize the formation of the vortex breakdown phenomenon. Cylindrical and conical-cylindrical geometries, both closed, were used in simulations. The rotating flow is induced by the bottom wall, which rotates at constant angular velocity. First, the numerical results were compared to experimental results available in references, aiming to verify the capacity of the computational code to predict the vortex breakdown phenomenon. Further, several simulations varying the parameters which govern the characteristics of the flows analyzed in this work, i.e. the Reynolds number and the aspect ratio were performed. In these simulations, the transitional limit and the limit of the vortex breakdown formation were verified. Steady and transient cases, with and without turbulence modeling, were simulated. In general, some aspects of the process of vortex breakdown in conical-cylindrical geometries were observed to be different from that in cylinders.

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