Comparative study of experimental and CFD results for stepped planing hulls

• In recent years, research has been conducted on reducing resistance by adding steps on the bottom of high-speedcraft. The most significant issue in the design of multi-stepped planing craft is the selection of an appropriate stepconfiguration, i.e., step geometry, location, and height. This requires a general knowledge of the hydrodynamicbehavior of each step configuration. Although the towing tank test is an effective method to predict accuratelythe hydrodynamic behavior of stepped planing boats, there are restrictions in studying some details. In this study,a Computational Fluid Dynamic (CFD) method is used to investigate the hydrodynamic behavior of a steppedplaning hull with eight different step configurations in detail. Comparison of the results of trim angle, resistance,sinkage, wetted surface, and ventilation length of swept-stepped planing hulls for different step configurations atvarious Froude numbers shows that a maximum average resistance reduction occurs at 1.9 < FrB < 4.0 with thestep height of 2.73% BTC located at 48.46% L from the transom. There is also a lower resistance associated with astep height of 0.91% BTC at 48.35% L distance from the transom at FrB > 4. These results can be used to improvehigh-speed planing hull performances by utilizing an appropriate step configuration.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Farkostteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Vehicle Engineering (hsv//eng)

Keyword

High-speed craft

Stepped planing hull

Computational fluid dynamic (CFD)

Dynamic overset grid

Low-resistance hull

Wetted surface

Publication and Content Type

ref (subject category)

art (subject category)