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Numerical Study of Sheet Cavitation Break-off Phenomenon on a Cascade Hydrofoil

Iga, Yuka and Nohmi, Motohiko and Goto, Akira and Shin, Byeong Rog and Ikohagi, Toshiaki (2001) Numerical Study of Sheet Cavitation Break-off Phenomenon on a Cascade Hydrofoil. In: CAV 2001: Fourth International Symposium on Cavitation, June 20-23, 2001, California Institute of Technology, Pasadena, CA USA. (Unpublished)

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2-D unsteady cavity flows through hydrofoils in cascade which is the most fundamental element of turbomachinery are numerically calculated. In particular, attention was paid to instability phenomena of the sheet cavity in transient cavitation condition and the mechanism of break-off phenomenon was examined. A TVD MacCormack's scheme employing a locally homogeneous model of compressible gas-liquid two-phase media was applied to analyze above cavity flows. The present method permits us to treat the whole cavitating/noncavitating unsteady flow field. By analyzing numerical results in detail, it became clear that there are at least two mechanisms in the break-off phenomena of sheet cavity; one is that re-entrant jets play a dominant role in such a break-off phenomenon, and the other is that pressure waves propagating inside the cavity bring about an another type of break-off phenomenon accompanied with cavity surface waves.

Item Type:Conference or Workshop Item (Lecture)
Subject Keywords:Cavitation, Numerical Analysis, Cascade Flow, Two-Phase Flow, Compressible Navier-Stokes Equation, Break-off Phenomenon, Re-entrant Jet
Record Number:CAV2001:sessionB2.001
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Usage Policy:The papers of this symposium proceedings are protected by copyright, retained by the authors. Authors control translation and reproduction rights to these works. However, readers are granted permission for individual, educational, research and non-commercial reproduction, distribution, display and performance of this work in any format. This permission is in addition to rights of reproduction granted under Section 107, 108, and other provisions of the U.S. Copyright Act.
ID Code:125
Deposited By: Imported from CAV2001
Deposited On:31 May 2001
Last Modified:03 Oct 2019 22:49

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