IMECH-IR  > 流固耦合系统力学重点实验室
Ventilated cavitating flow over a bluff body with special emphasis on the vortex-cavitation interaction
Zheng YN; Wang ZY(王志英); Wang GY
Source PublicationOCEAN ENGINEERING
2020-12-01
Volume217Pages:107925
ISSN0029-8018
AbstractThe objective of this paper is to investigate the vortex-cavitation interaction in ventilated cavitating flow over a bluff body at Reynolds number Re = 6.7 x 10(4) by numerical method. The results present that in the active cavitation area, the turbulent kinetic energy mainly distributes in the leading edge of the cavity and the gas-liquid interface of the shedding vortex. The intensity variation is closely related to the cavity morphology and the ventilated cavitation development. With the increase of the gas entrainment coefficient Q(nu), the ventilated cavitation reduces the turbulence intensity. Three well-employed vortex identification methods, omega(z) criterion, Q criterion and the improved Omega method, are applied to identify the vortex structures. The comparison shows that the improved Omega method can well capture the vortices of different intensity in the cavitating flow field without using the threshold value, especially for the formation of the vortices. As for the ventilated cavitation vortex dynamics, strong rotation appears with the shear layer rolling up and relatively strong shear occurs with the entrainment of vortices during the vortex formation. With the increase of Q(nu), both the rotation and shear in the active cavitation area tend to become weaken owing to the reduction of turbulent intensity.
KeywordVentilated cavitating flow Turbulent kinetic energy Vortex identification Vortex-cavitation interaction
DOI10.1016/j.oceaneng.2020.107925
Indexed BySCI ; EI
Language英语
WOS IDWOS:000597316900039
Funding OrganizationNational Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [11902323, 51839001]
Classification一类
Ranking1
ContributorWang, ZY
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/85784
Collection流固耦合系统力学重点实验室
Affiliation1.{Zheng Yanan、Wang Guoyu} Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China
2.{Wang Zhiying} Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Zheng YN,Wang ZY,Wang GY. Ventilated cavitating flow over a bluff body with special emphasis on the vortex-cavitation interaction[J]. OCEAN ENGINEERING,2020,217:107925.
APA Zheng YN,王志英,&Wang GY.(2020).Ventilated cavitating flow over a bluff body with special emphasis on the vortex-cavitation interaction.OCEAN ENGINEERING,217,107925.
MLA Zheng YN,et al."Ventilated cavitating flow over a bluff body with special emphasis on the vortex-cavitation interaction".OCEAN ENGINEERING 217(2020):107925.
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