This paper aims to numerically investigate violent sloshing in a partially filled three-dimensional (3D) prismatic tank with or without a baffle, further to clarify the suppressing performance of the baffle and the damping mechanism of sloshing. The numerical model is based on a Cartesian grid multiphase flow method, and it is well validated by nonlinear sloshing in a 3D rectangular tank with a vertical baffle. Then, sloshing in an unbaffled and baffled prismatic tank is parametrically studied. The effects of chamfered walls on the resonance frequency and the impact pressure are analyzed. The resonance frequencies for the baffled prismatic tank under different water depths and baffle heights are identified. Moreover, we investigated the effects of the baffle on the impact pressure and the free surface elevation. Further, the free surface elevation, pressure and vortex contours are analyzed to clarify the damping mechanism between the baffle and the fluid.

本文旨在数值研究带或不带挡板的部分填充的三维（3D）棱柱罐中的剧烈晃动，进一步阐明挡板的抑制性能和晃动的阻尼机制。该数值模型基于笛卡尔网格多相流方法，并通过具有垂直挡板的 3D 矩形储罐中的非线性晃动进行了很好的验证。然后，参数化研究了在无挡板和有挡板的棱柱罐中的晃动。分析了倒角壁对共振频率和冲击压力的影响。确定了不同水深和挡板高度下挡板棱柱形水箱的共振频率。此外，我们研究了挡板对冲击压力和自由表面高度的影响。此外，自由表面高程，