Numerical investigations of the transient cavitating vortical flow structures over a flexible NACA66 hydrofoil

doi:10.1007/s42241-020-0060-y

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-)

	Numerical investigations of the transient cavitating vortical flow structures over a flexible NACA66 hydrofoil
	Huang RF(黄仁芳); Du TZ(杜特专); Wang YW(王一伟); Huang CG(黄晨光)
刊名	JOURNAL OF HYDRODYNAMICS
	2020-10-01
卷号	32 期号:5 页码:865-878
关键词	Cloud cavitation LARGE-EDDY SIMULATION flexible hydrofoil VORTEX IDENTIFICATION METHODS Ω SPECIAL EMPHASIS method ADDED-MASS flow-induced vibration OMEGA VIBRATION DYNAMICS
ISSN号	1001-6058
DOI	10.1007/s42241-020-0060-y
英文摘要	In this paper, the cavitating flow over a flexible NACA66 hydrofoil is studied numerically by a modified fluid-structure interaction strategy with particular emphasis on understanding the flow-induced vibration and the cavitating vortical flow structures. The modified coupling approaches include (1) the hydrodynamic solution obtained by the large eddy simulation (LES) together with a homogenous cavitation model, (2) the structural deformation solved with a cantilever beam equation, (3) fluid-structural interpolation and volume mesh motion based on the radial basis functions and greedy algorithm. For the flexible hydrofoil, the dominant flow-induced vibration frequency is twice of the cavity shedding frequency. The cavity shedding frequency is same for the rigid and flexible hydrofoils, demonstrating that the structure vibration is not large enough to affect the cavitation evolution. The predicted cavitating behaviors are strongly three-dimensional, that is, the cavity is (a) of a triangular shape near the hydrofoil tip, (b) of a rectangular shape near the hydrofoil root, and (c) with a strong unsteadiness in the middle of the span, including the attached cavity growth, oscillation and shrinkage, break-off and collapse downstream. The unsteady hydroelastic response would strongly affect the cavitation shedding process with small-scale fragments at the cavity rear part. Furthermore, three vortex identification methods (i.e., the vorticity, the Q- criteria and the omega method) are adopted to investigate the cavitating vortex structures around the flexible hydrofoil. It is indicated that the cavity variation trend is consistent with the vortex evolution. The vortex structures are distributed near the foil trailing edge and in the cavitation region, especially at the cavity-liquid interface. With the transporting downstream the shedding cavities, the vortices gradually increase in the wake flows.
分类号	二类
WOS研究方向	Mechanics
语种	英语
WOS记录号	WOS:000588726800006
其他责任者	Du, TZ
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/85437]
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	{Huang Ren-fang, Du Te-zhuan, Wang Yi-wei, Huang Cheng-guang} Chinese Acad Sci Inst Mech Key Lab Mech Fluid Solid Coupling Syst Beijing 100190 Peoples R China
推荐引用方式 GB/T 7714	Huang RF,Du TZ,Wang YW,et al. Numerical investigations of the transient cavitating vortical flow structures over a flexible NACA66 hydrofoil[J]. JOURNAL OF HYDRODYNAMICS,2020,32(5):865-878.
APA	黄仁芳,杜特专,王一伟,&黄晨光.(2020).Numerical investigations of the transient cavitating vortical flow structures over a flexible NACA66 hydrofoil.JOURNAL OF HYDRODYNAMICS,32(5),865-878.
MLA	黄仁芳,et al."Numerical investigations of the transient cavitating vortical flow structures over a flexible NACA66 hydrofoil".JOURNAL OF HYDRODYNAMICS 32.5(2020):865-878.