Abstract
Abstract In this paper, the cavitating flow in a venturi tube is simulated by LES combined with the ZGB cavitation model. A satisfying agreement between the numerical and experimental results is obtained. The comparison among Liutex method, vorticity method, Q method, λ ci method and Ω method has shown that Liutex method could suppress interference of shearing and preserve intensity of vortex. Thus, Liutex vortex identification method was selected to analyse the interaction between cavitation and vortex based on our numerical results. It is found that the strong vortex ring in the throat induces the cavitation ring. The ring shape cavitation cloud develops into the diffuser and separates from the wall, where small vortices occur. Forced by the re-entrant flow and small vortices, the thickness of cavities reduces, resulting in the breaking and shedding of cavities. Shedding cavities rapidly collapse, strengthening the intensity of vortices around the cavities.
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