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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.
Lei Du; Zhuang Lin; Yi Jiang; Ping Li; Yue Dong. Numerical Investigation on the Scale Effect of a Stepped Planing Hull. Journal of Marine Science and Engineering 2019, 7, 392 .
AMA StyleLei Du, Zhuang Lin, Yi Jiang, Ping Li, Yue Dong. Numerical Investigation on the Scale Effect of a Stepped Planing Hull. Journal of Marine Science and Engineering. 2019; 7 (11):392.
Chicago/Turabian StyleLei Du; Zhuang Lin; Yi Jiang; Ping Li; Yue Dong. 2019. "Numerical Investigation on the Scale Effect of a Stepped Planing Hull." Journal of Marine Science and Engineering 7, no. 11: 392.
In order to investigate the drag-reducing effect of air intake, forward motion of planing trimaran models in calm water were simulated for Froude numbers ranging from 3.14–5.87. The hull body motion is implemented by coupling the fluid solver with motion solver. Numerical results were compared with the experimental data and showed good agreement. Contrastive calculations of models with and without air intake show that the air intake presents evident drag-reducing effect when Froude number is above 4.49, the cambered configuration of air intake could amplify air cavity and thus decrease fractional resistance. CFD incremental studies were subsequently carried out for the camber of air intake, it is found that the model with chamber-shortened air intake shows the worst resistance performance, while enlarging air intake chamber could reduce resistance at Froude numbers between 4.06 and 4.97.
Lei Du; Hanbing Sun; Yi Jiang; Ping Li. Numerical Research on the Resistance Reduction of Air Intake. Water 2019, 11, 280 .
AMA StyleLei Du, Hanbing Sun, Yi Jiang, Ping Li. Numerical Research on the Resistance Reduction of Air Intake. Water. 2019; 11 (2):280.
Chicago/Turabian StyleLei Du; Hanbing Sun; Yi Jiang; Ping Li. 2019. "Numerical Research on the Resistance Reduction of Air Intake." Water 11, no. 2: 280.