Abstract
Based on the FVM (finite volume method) numerical method, the flow field around the stepped planing hull in Taunton series was simulated. According to the general procedure of numerical uncertainty analysis, the numerical uncertainty in the high-speed flow field simulation of the stepped planing hull was discussed. Combined with the wave-making characteristics of the hull, the generation mechanism, shape evolution of air cavity, and the pressure distribution characteristics under the influence of the cavity, focuses on the variation of the flow around the stepped planing when the hull is in the triangle planing stage. Numerical results suggest that, as the air cavity enlarges, the cover rate of the air cavity can rise up to 77.8% of the whole wetted surface of the planing hull bottom. While, in the triangle planing stage, there is additional wetting at the aft bilge, which leads to the decrease of the air cavity rate and the increase of the wetted area. At the same time, the pressure distribution concentrates to the center of gravity.
Highlights
The stepped planing hull, which is named from a step setting under the bottom of a hull, is a high performance high-speed hull
Investigation on hydrodynamic characteristics of stepped planing hulls can be traced to 1950s, when the adopted method was mainly based on model tests
Shen et al [7] and Jiang et al [8] studied the resistance regression formula obtained for a two stepped hull and the mounting angle effects of stern flaps on the resistance performance of stepped planing hulls
Summary
The stepped planing hull, which is named from a step setting under the bottom of a hull, is a high performance high-speed hull. Investigation on hydrodynamic characteristics of stepped planing hulls can be traced to 1950s, when the adopted method was mainly based on model tests. Garland et al [2], Savitsky et al [3], and Taunton et al [4] investigated on the hydrodynamic characteristics of stepped planing hulls with various profile features through model tests. Filippo [9,10,11] discussed the frictional component of the resistance, the airflow path lines, and the volume of fraction in transversal and longitudinal sections in the ACS and multi- stepped hull design, and used air cavity solution to reduce the frictional component of the resistance of a high-speed planing yacht. Makasyeyev [12] discussed that in comparison with a step less hull, transverse steps can lead to higher lift-drag ratio
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call