SEISAN KENKYU
Online ISSN : 1881-2058
Print ISSN : 0037-105X
ISSN-L : 0037-105X
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Computations of cavitating vortex rope by using LES
Olivier PACOTChisachi KATOYang GUOYoshinobu YAMADE
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2016 Volume 68 Issue 1 Pages 63-68

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Abstract

The cavitating vortex rope developing downstream a Francis runner has been numerically studied for two off-design conditions. The first condition is a part load condition and the second a full load condition. The numerical approach selected is the Large Eddy Simulation using the FrontFlow/blue (FFB) software. To compute cavitating flows, the Okita cavitation model is implemented in FFB. The computations were performed on K supercomputer using 1,024 nodes. The mesh size features approximately 120 million elements. For both off-design conditions, the cavitating vortex ropes were qualitatively well reproduced. The shape of the vortex rope and the flow distribution within the diffuser are shown for each flow condition.

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© 2016 Institute of Industrial Science The University of Tokyo
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