局部气垫双体船是一种以细长型双体船为基础并辅以部分气垫支撑的新型高性能船舶，其底部扁平宽大，气垫排水体积占到全船的30%左右。由于气垫的存在，该船在波浪中航行时会产生诸多非线性特性，这对船体的运动性能有着重要影响。三维势流理论由于可以考虑流场的三维效应，且在船舶水动力学领域得到了广泛应用，因此可以有效应用于船舶强非线性运动特性的研究，这也正好与气垫船的非线性力学研究相吻合。本文的研究是建立在垫升系统的刚性气封形式基础上，并计及气垫的非线性特性，因此，为了验证局部气垫双体船刚性气封形式下的数值计算方法，研究其在波浪中的运动特性，本文采用自由液面法，分别采用重叠网格和滑移网格来分析其在静水中的计算误差，进而基于最佳网格形式对其在规则波中的航行性能进行了数值模拟，并与试验值进行对比，研究了船体总阻力的计算精度和不同波长下的运动参数特性。结果表明：重叠网格相对于滑移网格有着更高的静水阻力计算精度，在v=5.0 m/s最高达到5.2%；数值计算中船体总阻力的幅值和均值都大于试验值，且在波长为7.0 m处误差最大；从对各个运动参数的研究看出，各运动参数的历时曲线和试验值相比没有明显的差异性，而幅值响应的计算值普遍小于试验值，但在λ/L为2.33时计算值明显大于试验值。

Partial air cushion support catamaran (PACSCAT) is a new type of high-performance ship based on slender catamaran and supplemented by partial air-cushion support. Its bottom is flat and wide, and the air-cushion displacement volume accounts for about 30% of the whole ship. Due to the air cushion, the ship will have many nonlinear characteristics when sailing in the waves, influencing the motion performance of the hull heavily. The three-dimensional potential flow theory considers the three-dimensional effect of the flow field and it has been widely used in the field of ship hydrodynamics, so it can be effectively applied to the study of strong nonlinear motion characteristics of ships, which coincides with the study of nonlinear mechanics of hovercraft. The research was based on the rigid air seal form of the cushion system, and took into account the nonlinear characteristics of the air cushion. Therefore, in order to verify the form of numerical calculation method of PACSCAT with rigid seals, and study its movement characteristics in waves, this paper adopted the free surface method, and used overlapping grids and slip grids to analyze its performance in clam water. Furthermore, based on the best grid form, its navigation performance in regular waves was numerically simulated and compared with the experimental values, and then the calculation accuracy of the total hull resistance and the characteristics of the motion parameters under different wavelengths were studied. The results show that: overlapping grids have a higher hydrostatic resistance calculation accuracy than sliding grids, up to 5.2% when v=5.0 m/s. In the numerical calculation, the amplitude and average value of wave resistance are greater than the experimental value, and the error is the largest at the wavelength of 7.0 m. From the study of various wave motion parameters, it can be seen that there is no obvious difference between the duration curve of each motion parameter and the test value, and the calculated value of amplitude response is generally smaller than the experimental value, but the calculated value is obviously greater than the experimental value when λ/L is 2.33.