engleski

CFD Analysis of Surface-Piercing Hydrofoil Ventilation Inception

The paper presents a possibility of occurrence of ventilation phenomenon on the centerboard surface- piercing (SP) hydrofoil of a small autonomous unmanned surface vehicle (AUSV). Ventilation is a common problem associated with the design of surface-piercing hydrofoil crafts, which results in a loss of lift leading to undesired performance and consequences. Ventilation can be intentionally induced or can occur as a natural phenomenon at any air-water interface. In this work only spontaneous inception of the ventilation in transient motion of the separated flow region was considered. The main features are analyzed with the panel method such as coefficient of lift and drag for 3D wing. The free surface capturing was done using the volume of fluid (VOF) method to capture flow separation effect. CFD simulation was carried out for different attack angles, speeds and hydrofoil design in order to determine the probability of ventilation occurrence. Conclusions and suggestions for design of the hydrofoil are presented.

surface-piercing ; hydrofoil ; ventilation ; CFD

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