Investigation and comparison of hydrodynamic performance of symmetric and non-symmetric hydrofoils

Hydrofoils are applicational tools in hydrodynamic performance of marine equipment and structures which have attracted the attention of many researchers over the years. One of their application which is considered a new approach toward resistance reduction of the vessel, is their installatio on their hull. This will lead to the generation of hydrodynamic lift, especially at high speed which lead to reduction of frictional as well as resistive pressure. In this paper, hydrodynamic performance of symmetric and non-symmetric hydrofoils. The aim of the current study is to assess their performance for placing them as a mid-hull in trimaran vessel. Numerical computation is performed by Ansys-CFX software and the accuracy of the solution is assessed by available experimental data. RANS equations are solved and flow is analayzed as turbulent via the k-ε scheme. The obtained results indicate that hydrodynamic lift and drage of the foils at various velocities and angles of attack are quite different. Based on these results, it is concluded that non-symmetric foil possesses larger lift to drag ratio than symmetric foil.