Numerical Investigation of Cavitating Base MHKF-180s and Modified MHKF-180s Hydrofoil

Abstract

In this study, the hydrodynamic performance of 2D MHKF-180s hydrofoil (without dimple) and modified MHKF-180s hydrofoil (with dimple) is computationally anal7yzed. The investigation is conducted at a fixed angle of attack of 2° using the Realizable 5�ß “ 5�ß turbulence model and Zwart-GerberBelamri (ZGB) cavitation model. The main objective is to investigate the effect of dimple placed at 40% of the chord length for super cavitating condition and non cavitating condition. The simulations are performed at a constant Reynolds number, Re = 1.3×106 using Ansys Fluent. The hydrodynamic performance is evaluated based on various parameters, including lift coefficient (Cl ), drag coefficient (Cd), lift-drag ratio (l/d), pressure coefficient (CP ), vapor volume fraction, pressure variation, and turbulent kinetic energy. It was concluded that the dimple has no influence on super cavitating behavior. However, in the non-cavitating scenario, the sharp edge of the dimple leads to the formation of a small vapor cavity, resulting in a decrease in the lift coefficient and an increase in the drag coefficient.