Influences Of Hydrofoil Parameters On Resistance Performance Of Hyswath

In recent years,high-performance boat has brought an increasing number of opportunities and challenges to the marine industry.In addition to high speed,high-performance boats have the features which ordinary ships do not have,such as excellent seaworthiness,stability and comfort advantages.However,the current high-performance boats have their advantages and disadvantages.In the second half of the twentieth Century,a number of technical staff considered technology integration,to produce an idea of high-performance composite boats.HYSWATH not only retains the catamaran’s large deck area and good seakeeping performance,but also has the hydrofoil boats’ characteristics of low resistance and high speed,meanwhile improving the longitudinal stability of the hull.Thus,HYSWATH has an important role in the field of marine resources development,oil and gas exploration,maritime rights protection.Therefore,as a new ship with a more extensive market demand and prospects,HYSWATH have so excellent characteristics that we should carry out the corresponding technology research and exploration.This paper introduces the HYSWATH of displacement 400 t.First of all,CFD calculations of HYSWATH-400 model are compared with model test to validate numerical simulation methods whether it is feasible and reliability.Then,we discuss the influences of hydrofoils parameters which include the area of hydrofoils,hydrofoils position and attack angles of the hydrofoils on boat’s sailing attitudes and resistance properties.Through the CFD calculations of different hydrofoils parameters of HYSWATH,we discussed and analyzed the results and find that changes of hydrofoils parameters makes trim angle and translation of HYSWATH different,thenmakes the total resistance of the hull changed.In the range of speed we discuss,it is found that increasing the hydrofoil areas,reducing the distance of the front hydrofoil to the bow and adding the front hydrofoil setting angle(or decreasing the last hydrofoil setting angle)can effectively reduce the total resistance.