Resistance Analysis of a Hydrofoil Supported Watercraft (Hysuwac): A Case Study

Abstract

Energy efficiency and environmental sustainability are important aspects in ship design and operation. Hull-shape optimization, hull cleaning and coating, and the use of appendages are, among others, well-known efforts to reduce ship fuel consumption. Regarding energy efficiency and environmental sustainability, it is possible to effectively reduce the resistance of an existing catamaran by retrofitting a foil system to it. In this study, a foil system is designed and retrofitted to a catamaran to reduce its total resistance. Reynolds-averaged Navier-Stokes simulations, utilizing k-w SST turbulence model, were performed to study the effects of the foil system on the vessel’s total resistance. Free surface effects were modelled, i.e., the generation of waves due to the vessel’s movement on the water surface. The foil system affects the wetted surface area, running sinkage and trim, and the wave pattern generated by the vessel, which ultimately affect the vessel’s total resistance. At relatively low speeds (Fr < 0.7), an increase of the total resistance, reaching a value of approximately 11%, was observed due to the foil system. However, at higher speeds (Fr > 0.7), the foil system decreases the total resistance, reaching a value of approximately 32% at the service speed (Fr = 1.24). The 32% resistance reduction at the service speed is promising in view of the intended purpose of the foil system as an energy saving device.

Ship Performances CFD Analysis of Hydrofoil-Supported High-Speed Catamaran Hull Form

“…The rise in overall resistance at low velocities resulting from implementing the foil system is partially attributed to the augmentation of wave-making resistance. These data align with the conventional analytical expectations outlined by Suastika et al, [14] Figure 8 and 9 illustrate the fluid's viscous stress vectors acting on the wall. Specifically, Figure 9 provides a more detailed comparison between the base model (8a) and hysucat (8b) at Fr 0.65.…”

Numerical Analysis of Ship Motion of Crew Boat with Variations of Wave Period on Ship Operational Speed

“…For all NORDFORSK criteria will acceptable at small speed According to the analysis that has been done in Table 6 -8, it can be concluded that the ship is only able to sail safely at a speed of 0 Knot to 9 knots. Starting at a speed of 12 knots, the ship does not meet the seakeeping criteria according to NORDFORSK, 1987 [24,25], in particular slamming criteria are exceeded for speeds over 6 knots.…”

Water Depth Effect to Ferry Ship Resistance with Computational Fluid Dynamic Method

“…Predicting ship resistance in shallow water conditions is very important for ship propulsion system design considerations [1,2]. Shallow waters greatly affect viscous resistance and wave resistance, and propulsion efficiency.…”