The planing hull form has long been employed in modern marine vehicle design. Its improved performance in the high-speed range makes it a good candidate for powerboats, yachts, and other high-speed vessels. However, it is challenging to get an accurate and cost-effective prediction of resistance as well as dynamics, i.e., porpoising. The semi-empirical and analytic methods widely used today are based on gross hull parameters, limiting their applicability and accuracy. These methods do not provide details of the flow around the hull, and cannot reliably predict dynamic instabilities such as porpoising. In this paper, we present numerical simulations of a classical planing hull (Fridsma 1969) using a RANS-based CFD tool, and compare the predicted sinkage, trim, resistance, and porpoising behavior with experiments. In order to resolve the transient phenomena properly, the explicit Volume of Fluid (VOF) method is applied to solve the free surface. The transient, steady, and possibly unsteady motions of the vessel are captured through an embedded dynamic solver. Good agreement is shown with experiments, including prediction of dynamics, and results can be achieved with practical turn-around times on a single workstation.
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Prediction of Planing Hull Resistance and Porpoising using a RANS-based CFD Tool
Paper presented at the SNAME Maritime Convention, Houston, Texas, October 2017.
Paper Number: SNAME-SMC-2017-031
Published: October 24 2017
Bandyk, Piotr, Ding, Hui, and Chengjie Wang. "Prediction of Planing Hull Resistance and Porpoising using a RANS-based CFD Tool." Paper presented at the SNAME Maritime Convention, Houston, Texas, October 2017.
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