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research-article

Assessment of the reliability of two-equation URANS models in predicting a precessing flow

[+] Author and Article Information
Xiao Chen

School of Mechanical Engineering, Center for Energy Technology (CET), the University of Adelaide, SA. 5005, Australia
mecheng.xchen@gmail.com

Zhao Tian

School of Mechanical Engineering, Center for Energy Technology (CET), the University of Adelaide, SA. 5005, Australia
zhao.tian@adelaide.edu.au

Graham J. Nathan

School of Mechanical Engineering, Center for Energy Technology (CET), the University of Adelaide, SA. 5005, Australia
graham.nathan@adelaide.edu.au

1Corresponding author.

ASME doi:10.1115/1.4042748 History: Received May 31, 2017; Revised January 15, 2019

Abstract

A systematic assessment of unsteady Reynolds-Averaged Navier-Stokes (URANS) models in predicting the complex flow through a suddenly expanding axisymmetric chamber is reported. Five types of URANS models assessed in the study comprise the standard k-e model, the modified k-e (1.6) model, the modified k-e (1.3) model, the Re-Normalisation Group (RNG) k-e model and the Shear Stress Transport (SST) model. To assess the strengths and limitations of these models in predicting the velocity field of this precessing flow, the numerical results are assessed against available experimental results. Good agreement with the flow features and reasonable agreement with the measured phase-averaged velocity field, energy of total fluctuation and precession frequency can be achieved with both the standard k-e and the Shear Stress Transport (SST) models. The degree of accuracy in predicting the rate of both spreading and velocity decay of the jet was found to greatly influence the prediction of the precession motion.

Copyright (c) 2019 by ASME
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