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Assessment of turbulence models in hydrocyclones

DOI: 10.1615/THMT-18.490
pages 495-505

R. A. E. Oliveira
Escola de Quımica, Universidade Federal do Rio de Janeiro, Av. Moniz de Aragao 420, 21945-972 Rio de Janeiro, Brazil

R. P. Anjos
Escola de Quımica, Universidade Federal do Rio de Janeiro, Av. Moniz de Aragao 420, 21945-972 Rio de Janeiro, Brazil

T. S. Klein
Escola de Quımica, Universidade Federal do Rio de Janeiro, Av. Moniz de Aragao 420, 21945-972 Rio de Janeiro, Brazil

Abstract

Although hydrocyclones are geometrically simple, the flow field inside them is complex. Consequently, when it comes to CFD computations, Reynolds-stress-transport models are recommended. However these models require high computational efforts and make numerical simulations unstable and slow. Although linear-eddy-viscosity models are known to fail in predicting rotational flows, these are usually robust, relatively fast to converge and some of such models have been reported in the literature to capture rotational effects. Besides, non-linear- eddy-viscosity models have not been found to predict such rotational flows. The present study assesses the performance of linear and non-linear-eddy-viscosity and Reynolds-stress turbulence models in single-phase CFD simulations of a hydrocyclone in order to identify if simpler models are able to return reasonable results. Tangential velocity profiles from simulations were compared to experimental data. It has been observed that all linear and non-linear-eddy-viscosity models perform similarly and only Reynolds-stress-transport models are capable of representing qualitatively these profiles.

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