Numerical Study on Tip Vortex Cavitation Inception on a Foil

Park, Il-Ryong; Kim, Je-In; Paik, Bu‐Geun; Seol, Hanshin

doi:10.3390/app11167332

Cited by 7 publications

(2 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The nuclei caught in the vortex filament grow rapidly at the centre with minimum pressure, resulting in a continuous cavity structure or intermittent elongated bubbles (Rood 1991). The onset of cavitation further weakens the pressure gradient in the vortex core, resulting in a reduction in axial velocity (Park et al 2021;Xie et al 2021). The inception of cavitation depends on the distribution of the nuclei and the local pressure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamics of cavitating tip vortex

Wang

Shao

2023

J. Fluid Mech.

View full text Add to dashboard Cite

The three-dimensional dynamic behaviour of a tip vortex generated by a NACA $66_2$ -415 hydrofoil is investigated under wetted flow and cavitating conditions using time-resolved tomographic particle image velocimetry. Two main cavitation modes are studied, namely the breathing and double-helical modes. The time-averaged flow field consists of a system of two streamwise vortices for all three conditions. The shape of the tip vortex resembles that of the cavitation mode, instead of a circular cylinder. Multi-scale vortical structures are captured in the instantaneous flow field. The surface oscillation of the cavity contributes to the growth of Kelvin–Helmholtz instability over the tip vortex, leading to the onset of hairpin vortices. Stronger spanwise interaction between the tip vortex and flow separation of the hydrofoil is produced by cavitation, further intensifying the perturbation growth. The proper orthogonal decomposition analysis gives insight into the relationship between cavity oscillation and vortex instability. Two major types of unstable modes of the tip vortex are obtained, leading to serpentine centreline displacement and elliptical deformation motion. The selection of the dominant unstable mode is associated with cavity surface oscillation. For the wetted flow condition, the displacement mode dominates the growth of vortex perturbation, while for breathing mode cavitation, the most energetic unstable mode changes into an elliptical deformation pattern, the disturbance energy of which is negligible in the wetted flow condition. Consistency is found between the peak frequency of the deformation mode and the cavity resonance frequency, indicating the contribution of cavity oscillation to the disturbance growth and breakdown of the tip vortex.

show abstract

Section: Introductionmentioning

confidence: 99%

“…The onset of cavitation further weakens the pressure gradient in the vortex core, resulting in a reduction in axial velocity (Park et al. 2021; Xie et al. 2021).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of cavitating tip vortex

Wang

Shao

2023

J. Fluid Mech.

View full text Add to dashboard Cite

show abstract

Prediction of cavity inception speed and underwater radiated noise of a full-scale marine propeller based on a cavitation tunnel model test

Lee,

Ahn,

Lee

et al. 2024

Ocean Engineering

View full text Add to dashboard Cite

Numerical study on prediction and discrimination methods of propeller tip vortex cavitation inception

Duan

Cui

et al. 2023

AIP Advances

View full text Add to dashboard Cite

Tip vortex cavitation is typically the first type of cavitation in real ship propellers due to the scale effect. To lessen or eliminate propeller cavitation noise, it is necessary to effectively identify and predict the tip vortex cavitation initiation of the propeller and run the propeller as far as possible in the “non-cavitation area.” However, for the current numerical computation, it is impossible to determine the minimum pressure at the vortex core directly and correctly, making it difficult to anticipate the cavitation initiation of the propeller tip vortex. In this paper, based on computational fluid dynamics (CFD) numerical calculations and the tip vortex model proposed by Xin [Proceedings of 2013 Ship Hydrodynamics Conference (2013), pp. 211–218], we propose a new prediction method for propeller tip vortex cavitation initiation—“the tip vortex model method.” The propeller tip vortex is solved by CFD calculation in this model, and the minimum pressure at the downstream vortex core is examined based on the tip vortex model to determine the initiation of propeller cavitation. We examine the cavitation inception using the tip vortex model method and compare it to the results obtained using the minimum pressure coefficient method and the minimum vapor volume method. It is discovered that the cavitation inception number obtained by the tip vortex model method is closer to the experimental results. Furthermore, the effects of different turbulence models and grid settings on the prediction of tip vortex cavitation initiation are investigated, providing an effective reference for the prediction of propeller tip vortex cavitation initiation.

show abstract

Numerical Study on Tip Vortex Cavitation Inception on a Foil

Cited by 7 publications

References 31 publications

Dynamics of cavitating tip vortex

Dynamics of cavitating tip vortex

Prediction of cavity inception speed and underwater radiated noise of a full-scale marine propeller based on a cavitation tunnel model test

Numerical study on prediction and discrimination methods of propeller tip vortex cavitation inception

Contact Info

Product

Resources

About