以三体船的操纵性能预报为背景,基于势流理论的三维面元法,对三体船的斜拖运动进行数值模拟,并求得相应的水动力系数.将传统的运用于机翼升力计算的涡环栅格法(VLM)运用于三体船斜拖运动的数值模拟,船体表面被离散成四边形的网格,网格及尾涡面上布置一个涡环,利用船体表面不可穿透条件以及尾缘处的库塔条件对各单元涡强进行求解,求得各个分布点压强以及船体表面压力分布,并根据压力分布积分求得在不同漂角下三体船舶所受的横向力以及转首力矩.最终由计算结果,求得与漂角相关的水动力系数,并与软件计算结果进行对比分析.%The maneuverability of trimaran is set as the background of this paper. Based on the 3D panel method of po-tential flow theory, the oblique towing motion of trimaran is stimulated, and the hydrodynamic derivatives is calculated. Vor-tex lattice method (VLM), which is traditionally used to calculate the lift force of wings, is used for the numerical stimula-tion of trimaran oblique towing motion. Ship hull is derived into many quadrilateral panels, and vortex lattice is placed in every panels and trailing vortex plane. By unpenetrated condition of the hull and Kutta Condition in the trailing edge, the vorticity of every panel could be calculated, and the displacement of pressure on the hull surface could be obtained. Then the lateral force and moment around Z direction could be obtained. By the obtained result, the hydrodynamic derivatives which is related with the drift angle could be calculated, and be used for comparison with the hydrodynamic derivatives which is cal-culated by software.
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