Resistance And Seakeeping Performance Analysis Of Wave Piercing Catamaran With Combined Appendages

Wave Piercing Catamaran（WPC）is a new type of high-performance ship,which has a wider deck area than the single hull ship,and the speed of the ship can reach 50kn,which has better hydrodynamic performance than the ordinary single hull ship.However,when the ratio of wavelength to captain is1～1.5,the wave resistance of the Wave Piercing Catamaran is poor.How to further improve the navigation performance of the wave crossing catamaran under high sea conditions by adding appropriate ship appendages has important academic research significance and engineering application value.Based on the continuity equation of incompressible fluid and the equations of ship motion,the mathematical model of WPC is established.The numerical model is established by CFD technology and the software of FINE/Marine.The resistance and wave resistance of the ship with appendages are studied systematically.The main contents and conclusions of this thesis are as follows:（1）The three-dimensional numerical wave tank is established.By setting up the wave height measurement point,the wave form obtained is compared with the theoretical value,and the effectiveness of the numerical pool is verified.（2）The resistance and wave resistance of the two hull ship are simulated in the static water and regular waves.The results are in good agreement with the experimental results.The feasibility of the numerical calculation method is verified.（3）Based on the numerical analysis of hydrodynamic performance of T-foil,the influence of the installation position of horizontal wing,vertical wing and T-foil on the wave resistance of the Wave Piercing Catamaran is studied.The results show that the wing shape is NACA0012,the aspect ratio is3.84,the attack angle is 15°of horizontal wing;The vertical wing with the shape of NACA16021 and height of 0.25D can reduce the heave amplitude by 12.5%and the pitch amplitude by 4%when installed at 0.196L_PP away from the bow.（4）The influence of different length,width,different installation angle of stern flat and different height interceptor on the resistance performance of the wave crossing catamaran is studied.When Fr<0.7,the length is 1.5%L_PP,the width is 63%b and the installation angle is 6°.The maximum drag of the ship can be reduced by 7.4%and the total resistance of the ship can be reduced by 8.6%when the height is0.67‰L_PP.（5）The numerical simulation of the navigation of the wave crossing catamaran with appendages in regular waves is carried out.The resistance performance of the naked ship,the ship with interceptor,the ship with stern flat,the ship with T-foil and stern wave suppression plate,the ship with T-foil and interceptor are calculated and analyzed.The results show that in the wave,when Fr<0.7,the resistance performance of the ship is calculated and analyzed,The combined attachment of T-foil and wake wave plate increases the total resistance of the ship.The combined attachment with T-foil and interceptor can reduce the total resistance of the ship by 2.5%,while when Fr>0.7,the combined appendage with T-foil and interceptor can reduce the total resistance by 4%,while the combined appendage with T-foil and stern flat can reduce the total resistance of the ship by 5.5%.The results show that the response of the ship is compared under the same condition,such as the naked ship,the ship with interceptor,the ship with stern wave suppression plate,the ship with T-foil and stern flat,the ship with T-foil and interceptor.Whenλ/L_PP is near 1.5,the ship with combined appendage of T-foil and stern wave suppression plate can reduce the heave amplitude by 15%,while the ship with combined appendage of t-foil and interceptor can reduce the heave amplitude by 16%;Whenλ/L_PP is near2,the ship with combined appendage of T-foil and stern flat can reduce the pitch amplitude by 15.5%,and the combined appendage with T-foil and interceptor can reduce the pitch amplitude by 6.8%.It is concluded that,when Fr<0.7,the combined appendage of T-foil and interceptor is added,and when Fr>0.7,the combined appendage with T-foil and stern flat can not only reduce the total resistance of the ship,but also effectively improve the stern inclination of the ship.