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1- Ferdowsi University of Mashhad
Abstract: (38 Views)
As an autonomous underwater vehicle (AUV) moves near the free surface, it gives rise to distinctive wave patterns on the sea's surface and fosters the formation of bubbles around its body. The influence of free surface and bubble formation at high system velocities significantly affects the performance of the vehicle and requires further investigation. To numerically simulate wave patterns and partial cavitation bubbles, the submerged body was modeled using the NACA hydrofoil series. By altering the geometry, angle of attack, immersion depth, and cavitation number, variations in the wave amplitude and bubble shape were examined. As the submerged body approaches the sea level, the presence of the free surface becomes more significant, resulting in an increased wave amplitude. Additionally with decreasing submersion depth lift and drag coefficients decrease and decreasing cavitation number results in an expansion of the cavitation volume, consequently reducing the amplitude of the free surface wave.
Keywords: Hydrofoil, Cavitation, Free surface effect, Supercritical open channel flow, Computational Fluid Dynamic
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