Unsteady vortices in the test pump sump with 100 mm height and 100 mm diameter of the inlet pipe are investigated by performing large eddy simulations (LES). Computational grids composed of 2 billion hexahedral elements with 0.255 mm resolution were used for the LES. These grids resolve the turbulent boundary layer that develops on the wall of approaching channel; however it is not enough fine to capture viscous core of the submerged and air-entrained vortices. In this study, we focused to analyze how and why submerged and air-entrained vortices were appeared and disappeared. By performing LES for a long time period (∼16 seconds), we successfully captured the unsteady events several times, including generations and disappearances of the submerged and air-entrained vortices. In this paper, the details of the appearances and disappearances of vortices will be shown.
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ASME/JSME/KSME 2015 Joint Fluids Engineering Conference
July 26–31, 2015
Seoul, South Korea
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5732-8
PROCEEDINGS PAPER
Large Eddy Simulation of Unsteady Vortices in a Pump Sump
Yoshinobu Yamade,
Yoshinobu Yamade
Mizuho Information & Research Institute, Inc., Chiyoda-ku, Japan
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Chisachi Kato,
Chisachi Kato
University of Tokyo, Komaba Meguro-ku, Japan
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Takahide Nagahara,
Takahide Nagahara
Hitachi, Ltd., Tsuchiura-shi, Japan
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Jun Matsui
Jun Matsui
Yokohama National University, Hodogaya-ku, Japan
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Yoshinobu Yamade
Mizuho Information & Research Institute, Inc., Chiyoda-ku, Japan
Chisachi Kato
University of Tokyo, Komaba Meguro-ku, Japan
Takahide Nagahara
Hitachi, Ltd., Tsuchiura-shi, Japan
Jun Matsui
Yokohama National University, Hodogaya-ku, Japan
Paper No:
AJKFluids2015-33753, V01AT33A016; 11 pages
Published Online:
April 4, 2016
Citation
Yamade, Y, Kato, C, Nagahara, T, & Matsui, J. "Large Eddy Simulation of Unsteady Vortices in a Pump Sump." Proceedings of the ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. Volume 1A: Symposia, Part 2. Seoul, South Korea. July 26–31, 2015. V01AT33A016. ASME. https://doi.org/10.1115/AJKFluids2015-33753
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