Unsteady characteristics of cloud cavitating flow near the free surface

CORC > 力学研究所 > 中国科学院力学研究所 > 流固耦合系统力学重点实验室(2012-)

	Unsteady characteristics of cloud cavitating flow near the free surface
	Wang YW(王一伟); Wu XC(吴小翠); Huang CG(黄晨光); Wu XQ(吴先前)
刊名	International Journal of Multiphase Flow
	2016-05
卷号	80 页码:45-56
关键词	Cloud cavitating flow Free surface Large eddy simulation Cavity shedding Wave elevation
ISSN号	0301-9322
中文摘要	The effect of free surface on unsteady cloud cavitation is important for high-speed surface vehicles, However, previously published experimental and numerical works regarding this topic are limited. In this paper, a typical launching experiment is performed with the presence of free surface. A numerical approach is established by using large eddy simulation and volume-of-fluid methods. Firstly, unsteady evolutions of the cavity and re-entry jet are obtained in both experimental and numerical results, which agree well with each other. Results indicate that the cavity evolution on the upper side of projectile is remarkably different compared to the lower side under the free-surface effect. For instance, on the upper side, cavity growth is slower, the velocity of the re-entry jet is higher, the cavity sheds faster, and the position of shedding cavity collapse is closer to the main cavity. Secondly, the effect of the free surface is studied by analyzing the constraint variation. Because the flow stream around the upper surface is thin, changing its direction under the effect of pressure difference inside and outside the cavity is easy. Non-axisymmetric collapse features generate a mass of strong vortexes on the cylindrical surface, and the non-uniform distribution of high pressure region is also one of the most important factors to induce lateral and vertical forces on the projectile. Finally, the heights of wave elevation in cases with and without cavitation are compared. The presence of cavitation leads to an increase in wave height, but the increment is about half the thickness of the cavity. This finding indicates that the actual constraint effect is between the effects of the infinite water field and the fully free condition.
分类号	二类/Q1
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000381951000006
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/59606]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
作者单位	Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences
推荐引用方式 GB/T 7714	Wang YW,Wu XC,Huang CG,et al. Unsteady characteristics of cloud cavitating flow near the free surface[J]. International Journal of Multiphase Flow,2016,80:45-56.
APA	Wang YW,Wu XC,Huang CG,&Wu XQ.(2016).Unsteady characteristics of cloud cavitating flow near the free surface.International Journal of Multiphase Flow,80,45-56.
MLA	Wang YW,et al."Unsteady characteristics of cloud cavitating flow near the free surface".International Journal of Multiphase Flow 80(2016):45-56.