Abstract
This article discusses the scale effects on a planing boat, utilizing the computational fluid dynamics method. The simulation is compared with a tank test for verification and validation. The planing boat sails use both aerodynamics and hydrodynamics. Studying the performances and wave patterns of different dimensions of the models is the best way to investigate the scale effect without using experimental data. The resistance is discussed in two parts, namely residuary resistance and friction resistance, and is compared to the calculated data using the international towing tank conference (ITTC) formula. The computational fluid dynamics (CFD) calculations of the model are increased by 4.77% on average, and the boat computations are also increased by 3.57%. The computation shows the scale effect in detail. The residuary resistance coefficients at different scales are approximately equal, and the friction resistance coefficients show the scale effect. The scale effect for longitudinal steadiness is also captured for the period of the porpoising behavior. The rational for the full-scaled boat oscillation period and the model is the root of the scales.
Highlights
Since the establishment of the first towing tank by Froude, the model test has always been the main means by which to study the hydrodynamic performance of ships
Some similarity criteria can be used to convert these hydrodynamic characteristics into technical data, which can be utilized in the ship design directly
The numerical methods commonly used in the hydrodynamics study of planing boats can be divided into two categories according to the theory which they are based on
Summary
Since the establishment of the first towing tank by Froude, the model test has always been the main means by which to study the hydrodynamic performance of ships. Taunton et al designed four serial models with different length/width ratios after studying the dimensions of the existing high-speed planing boats, and investigated the resistance and behaviors in calm water and wave conditions by using the tank test [2,3]. The numerical methods commonly used in the hydrodynamics study of planing boats can be divided into two categories according to the theory which they are based on. Yousefi pointed out that RANSE is currently the most effective method for simulation of the viscous flow field around a planing boat [13].
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