Based on the viscous flow field solved by RANS equations and VOF method, the nonlin-ear characteristics of longitudinal motions and wave loads for Small Waterplane Area Twin Hulls (SWATH) in regular head waves are investigated. Comprehensive comparison between the numerical results and experimental data is carried out to validate the proposed approach. Further, the influence of the wave height on the 1st and 2nd harmonics of heave and pitch motions, vertical accelerations as well as wave loads are analyzed in details. The study indicates that there are nonlinear effects for the longitudinal motions and wave loads of SWATH ship in regular head waves, which is particular-ly significant at the resonance region. Additionally, the nonlinear characteristics are much stronger for the vertical acceleration as well as wave loads than for the heave and pitch motions.%基于RANS方程和VOF模型求解船体粘性兴波流场,开展了小水线面双体船(Small Waterplane Area Twin Hulls,SWATH)迎浪规则波中纵向运动及波浪载荷的非线性特性研究.通过数值计算结果与模型试验结果的对比分析,验证了文中方法的有效性;在此基础上,较为系统地分析了SWATH船的垂荡及纵摇运动响应、垂向加速度和波浪载荷的一阶及二阶量随入射波高的变化规律,指出SWATH船的运动响应及载荷与波高存在非线性的关系,尤其体现在响应共振区附近;相比于船体垂荡和纵摇运动,垂向加速度及波浪载荷的非线性特性更为显著.
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