Study on the Resistance Reduction on High-Speed Vessel by Application of Stern Foil Using CFD Simulation

Abstract

Stern foil is an innovation that can be used on high-speed vessel craft. This innovation uses the same principles as interceptor but using hydrofoil. Interceptor are used to reduce the wetted surface area of the transom by making vortex under the transom, this kind of change will increase speed and reduce the total resistance of the ship. The mechanism on how the stern foil reduces the total resistance is an interesting question in term of ship hydrodynamics. This study aims to analyse the resistance reduction on high-speed patrol vessel by application of stern foil using simulation model. The study was carried out using computational fluid dynamics (CFD) with hydrodynamic parameters using a variation of the angle of attack 3˚ and 0˚ on Froude number range 0.6-1.3 with service load at 2 kg. The simulation result was obtained the optimal work for stern foil is at service load (2 kg) is a reduction in the total resistance of about 26,70% with the angle of attack is 0˚ in Froude number 0.9.

Analysis of the Use of Stern Foil on the High Speed Patrol Boat on Full Draft Condition

“…This triggers optimum functioning of the stern foil, raises part of the ship's hull and reduces the overall resistance that exists on the ship models. There is the most optimal condition where stern foil has succeeded in reducing resistance by 24.84 % in Fn 1.2 conditions, this results consistent with the previous results 27,28) . Whereas in the loading conditions of 3 kg (+ 500 gr), it is clear that the conditions of ship model exceed the displacement capacity (3.25 kg) and also the lift force produced by the stern foil (2.8 kg).…”

Lift-to-Drag Ratio of the Application of Hydrofoil With Variation Mounted Position on High-Speed Patrol Vessel

“…Total ship reduction the addition of a hydrofoil ranges from 10% to 28% depending on variations in the angle of attack [18,19]. Another factor on the effectiveness of hydrofoils is regarding the ship's draft [20], from the results of previous studies showing that the ship's draft at full load will increase the effectiveness of using hydrofoil in reducing total resistance by up to 24% [21]. Another study also showed that the position of the foil in the vertical direction also had an effect on hydrodynamic performance [22].…”

Effect of Angle of Attack Variation of Stern Foil on High-Speed Craft on Various Speed with Computational Fluid Dynamics Method

“…Figure 5 presents a comparison of experiments and simulations using CFDSOF. To ensure the validity of the results from CFDSOF, an additional validation using other commercial software has been performed using a previous study (Budiyanto et al, 2020a). The comparison results show good agreement and indicate that the setup is accurate and can be used in vessels with a stern foil.…”