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Ventilated cloud cavitating flow around a blunt body near the free surface
Wang YW(王一伟); Wu XC(吴小翠); Huang CG(黄晨光)
Conference NameInternational Symposium on Transport Phenomena and Dynamics of Rotating Machinery
Conference Date10-15 Apr 2016
Conference PlaceSheraton Waikiki Hotel, Honolulu, USA
AbstractAbstractVentilated cavitation occurs as an extremely complicated problem if the free surface is close to the cavity boundary around the high-speed underwater vehicle. The cavitating flow around a blunt axisymmetric body very near the free surface is investigated in the present paper. The typical experiment is carried out in a launching system based on an SHPB device, and the numerical scheme is established on the basis of large eddy simulation (LES) and volume of fraction (VOF) methods. Unsteady behaviors such as air injection and shedding of the cloud cavity were obtained, and good agreement was achieved between the numerical and experimental results. The distinctions of evolution features between the cavities on the up and down sides are presented and analyzed. Firstly, strong injection of non-condensable air occurs and changes the media property inside the cavity, which makes the cavity much larger and more stable. Furthermore, because of the small distance between the vehicle and the free surface, the re-entry jet generated in the upper part is very thin and cannot cut off the main cavity clearly, which induces that the upper part of the cavity is approximately unchanged after the growth stage and no shedding phenomenon occurs inside it.
KeywordVentilated Cavitation Free Surface Large Eddy Simulation
Funding OrganizationThe authors are grateful to the national natural science foundation of china (NSFC) through grant numbers 11202215&11332011.
Document Type会议论文
Recommended Citation
GB/T 7714
Wang YW,Wu XC,Huang CG. Ventilated cloud cavitating flow around a blunt body near the free surface[C],2016.
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