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Title:
Ventilated cloud cavitating flow around a blunt body close to the free surface
Author: Wang YW(王一伟); Xu, Chang; Wu XC(吴小翠); Huang CG(黄晨光); Wu XQ(吴先前)
Source: PHYSICAL REVIEW FLUIDS
Issued Date: 2017-08-22
Volume: 2, Issue:8
Abstract: Ventilated cavitation occurs as a complicated problem if the free surface is close to the cavity boundary around a high-speed underwater vehicle. The present study investigate the cavitating flow around a blunt axisymmetric body very near the free surface. A typical experiment is conducted by using a launching system with a split Hopkinson pressure bar device, and a numerical scheme is established based on large eddy simulation and volume-of-fluid methods. Unsteady behavior, including air entrainment and shedding of the cloud cavity, is observed, and high consistency is achieved between numerical and experimental results. Distinctions of evolution features between the cavities on the upper and lower sides are presented and analyzed. First, strong entrainment of noncondensable air occurs and changes the fluid property inside the cavity, which makes the cavity larger. Moreover, given the small distance between the vehicle and the free surface, the re-entrant jet generated in the upper part is thin and cannot completely cut off the main cavity, which causes the upper part of the cavity to remain approximately unchanged after the growth stage without the occurrence of the shedding phenomenon. Finally, the evolution of vortex structures is also discussed by comparisons with the motions of the air entrainment, re-entrant jet, and shedding cavity.
Language: 英语
Indexed Type: SCI
Corresponding Author: Huang, CG (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China.
Correspondent Email: huangcg@imech.ac.cn
DOI: 10.1103/PhysRevFluids.2.084303
Related URLs: 查看原文
DOC Type: Article
WOS Subject: Physics, Fluids & Plasmas
WOS Subject Extended: Physics
WOS Keyword Plus: LARGE-EDDY SIMULATION ; NUMERICAL-SIMULATION ; UNSTEADY CAVITATION ; SHALLOW-WATER ; HYDROFOIL ; MODEL ; PREDICTION
WOS ID: WOS:000408129900002
ISSN: 2469-990X
Funder: National Natural Science Foundation of China(11202215 ; Youth Innovation Promotion Association CAS(2015015) ; 11332011)
Department: LMFS冲击与耦合效应(LHO)
Classification: Q4
Ranking: 1
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/70030
Appears in Collections:流固耦合系统力学重点实验室(2012-)_期刊论文

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Recommended Citation:
Wang YW,Xu, Chang,Wu XC,et al. Ventilated cloud cavitating flow around a blunt body close to the free surface[J]. PHYSICAL REVIEW FLUIDS,2017-08-22,2(8).
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