2026
Yin, Tingyun; Pavesi, Giorgio
Numerical investigation of transient sheet/cloud cavitating flow around hydrofoil via incompressible and compressible methods Journal Article
In: OCEAN ENGINEERING, vol. 343, 2026.
Abstract | Links | BibTeX | Tags: Cavitation, CFD, CFD simulation, Compressible method, Hydrofoil, Incompressible method
@article{<LineBreak> 11577_3586598,
title = {Numerical investigation of transient sheet/cloud cavitating flow around hydrofoil via incompressible and compressible methods},
author = {Tingyun Yin and Giorgio Pavesi},
doi = {10.1016/j.oceaneng.2025.123271},
year = {2026},
date = {2026-01-01},
urldate = {2026-01-01},
journal = {OCEAN ENGINEERING},
volume = {343},
publisher = {PERGAMON-ELSEVIER SCIENCE LTD},
abstract = {This study compares two numerical analyses of dynamic cavitating flow from a sheet to a cloud considering both incompressible and compressibility models. In the incompressible simulation, the densities of the liquid and vapor remain constant. However, in the compressible case, the Tait equation of state and the ideal gas equation of state are used to characterize the two density attributes. The results demonstrate that the development of cavitation morphology can be effectively replicated using two methods. The predicted frequency of cloud shedding utilizing the compressible methodology is lower than that of the incompressible technique, exhibiting a disparity of around 31.40 %. However, the time-averaged force coefficients predicted by the two techniques are highly similar. The research conducted on the destabilization of sheet bubbles indicates that the condensation shock that is triggered by the inertia exerts a dominant influence on the local flow field. The backward flow beneath the sheet bubble is not the cause, but rather the outcome. Pressure pulses generated propagate in all directions as the cloud bubble above the hydrofoil surface collapses. Thus, pressure surges can have a substantial impact on hydraulic performance.},
keywords = {Cavitation, CFD, CFD simulation, Compressible method, Hydrofoil, Incompressible method},
pubstate = {published},
tppubtype = {article}
}
This study compares two numerical analyses of dynamic cavitating flow from a sheet to a cloud considering both incompressible and compressibility models. In the incompressible simulation, the densities of the liquid and vapor remain constant. However, in the compressible case, the Tait equation of state and the ideal gas equation of state are used to characterize the two density attributes. The results demonstrate that the development of cavitation morphology can be effectively replicated using two methods. The predicted frequency of cloud shedding utilizing the compressible methodology is lower than that of the incompressible technique, exhibiting a disparity of around 31.40 %. However, the time-averaged force coefficients predicted by the two techniques are highly similar. The research conducted on the destabilization of sheet bubbles indicates that the condensation shock that is triggered by the inertia exerts a dominant influence on the local flow field. The backward flow beneath the sheet bubble is not the cause, but rather the outcome. Pressure pulses generated propagate in all directions as the cloud bubble above the hydrofoil surface collapses. Thus, pressure surges can have a substantial impact on hydraulic performance.
2023
Yin, Tingyun; Pavesi, Giorgio; Yuan, Shouqi
Influenced of Bio-Inspired Leading-Edge Tubercle on Cloud Cavitation Around NACA 0009 Hydrofoil Proceedings Article
In: ETC, (Ed.): Proceedings of 15th European Conference on Turbomachinery Fluid dynamics & Thermodynamics ETC15, April 24-28 2023; Budapest, Hungary, pp. 1-14, ETC, 2023.
Abstract | Links | BibTeX | Tags: Bio-Inspired, Cavitation, Hydrofoil, Tubercle
@inproceedings{YinPav2023-02,
title = {Influenced of Bio-Inspired Leading-Edge Tubercle on Cloud Cavitation Around NACA 0009 Hydrofoil},
author = {Tingyun Yin and Giorgio Pavesi and Shouqi Yuan},
editor = {ETC},
url = {https://research.dii.unipd.it/tes/},
year = {2023},
date = {2023-01-01},
urldate = {2023-01-01},
booktitle = {Proceedings of 15th European Conference on Turbomachinery Fluid dynamics & Thermodynamics ETC15, April 24-28 2023; Budapest, Hungary},
pages = {1-14},
publisher = {ETC},
abstract = {The current work numerically investigated the cloud cavitation around the hydrofoil with leading-edge tubercles, aiming to determine the dynamic characteristics of the bubble cluster and induced vortices. Also, comparisons between the baseline and modified hydrofoils were made to determine the influence of leading-edge tubercles on the partial cavity oscillation. The results show that the lift-to-drag ratio of the bionic hydrofoil is improved by 6.60% though the force coefficients are reduced. The instability mechanisms associated with cloud cavitation around two hydrofoils are different. Specifically, the re-entrant jet and a pair of streamwise vorticity are the reasons for the bubble instability around the baseline and bionic hydrofoils, respectively. Although the bionic hydrofoil is symmetry, both bubbles and vortices distribute in an asymmetry manner. Therefore, the proper orthogonal decomposition modes of the pressure field around two hydrofoils are different but closely coherent with the development of vortices.},
keywords = {Bio-Inspired, Cavitation, Hydrofoil, Tubercle},
pubstate = {published},
tppubtype = {inproceedings}
}
The current work numerically investigated the cloud cavitation around the hydrofoil with leading-edge tubercles, aiming to determine the dynamic characteristics of the bubble cluster and induced vortices. Also, comparisons between the baseline and modified hydrofoils were made to determine the influence of leading-edge tubercles on the partial cavity oscillation. The results show that the lift-to-drag ratio of the bionic hydrofoil is improved by 6.60% though the force coefficients are reduced. The instability mechanisms associated with cloud cavitation around two hydrofoils are different. Specifically, the re-entrant jet and a pair of streamwise vorticity are the reasons for the bubble instability around the baseline and bionic hydrofoils, respectively. Although the bionic hydrofoil is symmetry, both bubbles and vortices distribute in an asymmetry manner. Therefore, the proper orthogonal decomposition modes of the pressure field around two hydrofoils are different but closely coherent with the development of vortices.
