Abstract
Spray strips are deflectors added to the hull to reduce the Wetted Surface Area (WSA). The reduced WSA will decrease the total ship drag caused by the deflection of the spray strip installation. The research aimed to predict the function of the spray strip to improve ship performance using Computational Fluid Dynamics (CFD). The numerical approach in this study used the Finite Volume Method (FVM) with the RANS (Reynolds-averaged Navier–Stokes) equation to solve fluid dynamics problems. VOF (Volume of Fluid) was used to model the water and air phases. The results of this study indicated that the number of spray strips would have a significant effect compared to without using a spray strip. Spray strips with three strips could reduce the total resistance by 4.9% at Fr 1.78. Spray strips would increase the total resistance value by 2.1% at low speeds. Spray strips were effective for reducing total resistance at Fr > 1 or the planing mode conditions. The total resistance prediction used three suggestion profiles with the best performance to reduce total resistance by 6.0% at Fr 1.78.
Highlights
High-speed vessels have unique characteristics, such as dynamic pressure at the hull’s bottom, slamming, porpoising, trim, and heave
The results showed that the spray strip reduced the total resistance by
The present paper aims to fill the gap in modelling spray rail in calm water condition by simulating performance of planing hulls equipped with a new type of spray rail, which is different from common ones
Summary
High-speed vessels have unique characteristics, such as dynamic pressure at the hull’s bottom, slamming, porpoising, trim, and heave. According to research on high-speed planing hull, 15–20% spray resistance can occur along the moving hull [1,2]. The Spray Strip is a ship hull modification that reduces the wetted surface area (WSA), especially in the spray area. Spray strips work by deflecting the spray stream in front of the stagnation line. The determination of the stagnation line is significant to apply spray strips. The stagnation line definition is discussed in detail in several studies
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