NUMERICAL STUDY OF FREE SURFACE EFFECT ON THE FLOW AROUND SHALLOWLY SUBMERGED HYDROFOIL (original) (raw)
The wave generation due to the presence of a body moving at steady forward speed beneath a free surface has been the subject of extensive research work in marine hydrodynamics. In this study, the free surface effect on the flow around shallowly submerged hydrofoil is numerically computed. Finite Volume Method (FVM) based on Navier-Stokes equations is used for this purpose. The standard NACA 0012 hydrofoil section is used for ease of comparison with available experimental data. The k-ε turbulence model has been implemented to simulate turbulent flow past the foil surface. To get the free surface elevation, "Volume of Fluid" (VOF) method is incorporated in numerical simulation. Grid independency is checked using four grids of different sizes. To validate the computational results, the free surface wave generated by the flow around hydrofoil at submergence depth ratio h/c = 0.91 is compared with experimental results published by Duncan. The computed results show satisfactory agreement with the experimental measurements. Finally, free surface effects on wave profile are computed for six submergence depth ratios, h/c ranging from 0.911 to 4.0 and maximum amplitude at two different Froude nos. (F n = 0.5672 and 0.70)
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