针对船舶的非线性运动难以界定和非线性运动难以预报的问题,以供应船为研究对象,采用CFD商用软件FLUENT,结合动网格技术对大振幅平面运动机构试验进行数值模拟,通过对比不同工况的流场压力云图,分析得出供应船水动力达到非线性的振幅范围.设计供应船非线性运动的试验方案,分别模拟不同频率时的大漂角斜航运动及大振幅的纯纵荡、纯横荡、纯首摇、组合运动,拟合得到接近零频率的非线性水动力导数.%For the problem that the nonlinear dynamics of ships are difficult to define and forecast, this article uses CFD commercial software FLUENT in combination with dynamic mesh to simulate the large amplitude planar motion mechanism test for a supply vessel.The range of nonlinear motion amplitude of the supply vessel is obtained by comparing the pressure nephograms of different scenarios.Besides, the test scheme of the supply vessel's nonlinear motion is designed.The large drift angle of oblique motion and large amplitude of pure surge, pure sway, pure yaw, combination movement with several frequencies are simulated, respectively.Finally, the nonlinear hydrodynamic derivatives close to zero frequency are calculated.
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