Prediction of Air-Entrained Vortex in Pump Sump: Influence of Turbulence Models and Interface-Tracking Methods
Publication: Journal of Hydraulic Engineering
Volume 146, Issue 4
Abstract
An air-entrained vortex is a complicated and negative phenomenon in a pump sump. Due to the unsteady vortical and two-phase-flow properties, its prediction is challenging. In this paper, advanced turbulence models sensitive to rotation and an interface tracking method for complex interfaces were applied to a benchmark pump sump case. For comparison, conventional models or method also were adopted. The performance of these approaches was investigated in detail based on the open-source computational fluid dynamics (CFD) code OpenFOAM. Comparison of various turbulence models revealed that the models which included rotation effects achieved better performance. The air-entrained vortex was found to be a relatively small-scale vortex with large turbulence energy. For the interface tracking, the simplified coupled level set and volume of fluid (S-CLSVOF) method, which combines the volume of fluid and level set methods, was proven to be more appropriate. The air-entrainment rate can be used to judge when the air-entrained vortex occurs during the numerical simulation if S-CLSVOF is used. In general, the advanced methods introduced in this paper are promising in reproducing the air-entrained vortex in pump sump.
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Acknowledgments
The authors acknowledge the financial support given by the National Natural Science Foundation of China (Grant Nos. 51806187 and 51679208).
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Published In
Journal of Hydraulic Engineering
Volume 146 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Mar 14, 2019
Accepted: Aug 23, 2019
Published online: Jan 21, 2020
Published in print: Apr 1, 2020
Discussion open until: Jun 21, 2020
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