Simulation of Water Wave Generated by Shallowly Submerged Asymmetric Hydrofoil

Abstract

In this study the wave generated by flow around a shallowly submerged cambered hydrofoil near free surface is simulated numerically. The standard NACA 4412 hydrofoil section is used for ease of comparison with available experimental data. A commercial computational fluid dynamics (CFD) code FLUENT based on finite volume technique is used for the analysis of the two dimensional hydrofoil section. The k-ɛ turbulence model has been implemented to simulate turbulent flow past the foil in the free surface zone at different submergence ratios (h/c). To get the free surface elevation, ‘Volume of Fluid’ (VOF) method is incorporated in numerical simulation. To validate the computational results, the free surface wave generated by the flow around hydrofoil at submergence depth ratio h/c = 1 is compared with experimental results. The computed results show satisfactory agreement with the experimental measurements. Then free surface effects on wave profile are computed for six submergence depth ratios, h/c ranging from 1 to 5. Finally, the pressure coefficients at the trailing edge and hydrodynamic forces are computed at Fn=1, Re=3.11x 106 for different h/c ratios.