Role of Turbulence Model in Prediction of Pump-Bay Vortices
Publication: Journal of Hydraulic Engineering
Volume 126, Issue 5
Abstract
A numerical model was developed by the writers to simulate the flow in a water-pump intake bay. Among the flow features of interest are subsurface vortices attached to the walls of the channel, and free-surface vortices. Such vortices are observed in laboratory models. This technical note is concerned with the role of the turbulence model and influence of wall roughness in the prediction of location, size and strength of different types of vortices, and the level of swirl in the intake pipe. Calculations made with the k-ε and the k-ω models were found to predict vortices of similar shape and size, but their locations and strength depended on the turbulence model and treatment of the near-wall flow. Weaker vortices were predicted when wall roughness was taken into account, raising the possibility of using roughness as a vortex suppression device.
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References
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Chen, H. C., and Patel, V. C. (1988). “Near-wall turbulence models for complex flows including separation.” AIAA J., 26, 641–648.
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Constantinescu, G. S., and Patel, V. C. (1998). “A numerical model for simulation of pump-intake flow and vortices.”J. Hydr. Engrg., ASCE, 124(2), 123–134.
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Melville, B. W., Ettema, R., and Nakato, T. (1994). “Review of flow problems at water intake pump sumps.” EPRI Res. Proj. RP3456-01 Final Rep., Iowa Institute of Hydraulic Research, University of Iowa, Iowa City, Iowa.
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Rajendran, V. P., Constantinescu, S. G., and Patel, V. C. (1999). “Experimental validation of a numerical model of flow in pump-intake bays.”J. Hydr. Engrg., ASCE, 125(11), 1119–1126.
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Wilcox, D. C. (1993). Turbulence modeling for CFD. DCW Industries, Inc., La Canada, Calif.
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 126 • Issue 5 • May 2000
Pages: 387 - 391
History
Received: Dec 29, 1998
Published online: May 1, 2000
Published in print: May 2000
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