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A new modelling of cavitating flows: a numerical study of unsteady cavitation on a hydrofoil section

Published online by Cambridge University Press:  26 April 2006

Akihiro Kubota ,
Hiroharu Kato  and
Hajime Yamaguchi
Akihiro Kubota
Affiliation:
Department of Naval Architecture and Ocean Engineering. Faculty of Engineering, The University of Tokyo, 7–3-1 Hongo, Bunkyo-ku, Tokyo 113. Japan
Hiroharu Kato
Affiliation:
Department of Naval Architecture and Ocean Engineering. Faculty of Engineering, The University of Tokyo, 7–3-1 Hongo, Bunkyo-ku, Tokyo 113. Japan
Hajime Yamaguchi
Affiliation:
Department of Naval Architecture and Ocean Engineering. Faculty of Engineering, The University of Tokyo, 7–3-1 Hongo, Bunkyo-ku, Tokyo 113. Japan
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Abstract

A new cavity model that can explain the interaction between viscous effects including vortices and cavitation bubbles is presented in this study. This model, which is named a bubble two-phase flow (BTF) model, treats the inside and outside of a cavity as one continuum by regarding the cavity as a compressible viscous fluid whose density changes greatly. Navier–Stokes equations including cavitation bubble clusters are solved in finite-difference form by a time-marching scheme, where the growth and collapse of a bubble cluster is given by a modified Rayleigh's equation. Computation was made on a two-dimensional flow field around a hydrofoil NACA0015 at angles of attack of 8° and 20°. The Reynolds number was 3 × 105. The experiments were also performed at the same Reynolds number for comparison. The computed results by the BTF cavity model can express the feature of cloud-type cavitation shed from the trailing edge of the attached cavities when the angle of attack is 8°. It shows the mechanism of cavitation cloud generation and large-scale vortices. The boundary layer separates at the cavity leading edge. Then it rolls up and produces the cavitation cloud. In other words, the instability of the shear layer may produce the cavitation cloud. When the angle of attack is 20°, the flow was fully separated from the leading edge of the hydrofoil and vortex cavitation occurs in the separated region. The BTF cavity model can also express the generation of such vortex cavitation and the effect of cavitation nuclei in the uniform flow.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 240 , July 1992 , pp. 59 - 96
Copyright
© 1992 Cambridge University Press

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