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Co-simulation of ship motions and sloshing in tanks

机译：共同模拟船舶运动和坦克晃荡

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摘要

Ship dynamics in presence of sloshing is addressed in time-domain through a co-simulation approach. A nonlinear blended 6-DOF ship motion solver, addressing rigid body dynamics and external fluid-structure interaction, is coupled with a 3D Weakly Compressible Smoothed-Particle Hydrodynamics (WC-SPH) solver, addressing the internal fluid dynamics. The coupling is carried out by means of network communication, which is suitable for grid computing. The resulting co-simulation approach is able to address nonlinear ship motions together with nonlinear sloshing in internal tanks. The two solvers and the co-simulation strategy are presented, together with two example applications. One example application addresses the roll motion of a vessel, with and without an anti-rolling tank, in regular beam waves. The effect of varying the anti-rolling tank length and the effect of varying the forcing wave steepness are investigated. Simulations disclose nonlinear phenomena and indicate the capability of the developed approach of identifying the reduction of anti-rolling tank effectiveness for too small tank lengths and/or too large forcing wave steepnesses. A second application is presented, for validation purposes, where simulations are compared with experimental data from literature regarding roll and heave for a tanker hull form in regular beam waves, with and without a partially filled tank.
机译：通过协同仿真方法可以在时域内解决存在晃荡的船舶动力学问题。非线性混合六自由度船舶运动求解器（用于解决刚体动力学和外部流体-结构相互作用）与3D弱可压缩平滑颗粒流体动力学（WC-SPH）求解器结合使用，解决了内部流体动力学问题。耦合是通过适用于网格计算的网络通信进行的。由此产生的协同仿真方法能够解决非线性船舶运动以及内部储罐中的非线性晃动问题。给出了两个求解器和协同仿真策略，以及两个示例应用程序。一个示例应用程序解决了有规则和无规则防浪箱的情况下船只的摇晃运动。研究了改变防倾舱长度的影响和改变强迫波陡度的影响。仿真揭示了非线性现象，并表明了开发的方法能够识别出过小的油箱长度和/或太大的推力波陡度，从而降低了防滚油箱的有效性。为了验证的目的，提出了第二个应用，其中将模拟与来自文献的有关在规则波束波中有或没有部分装满油箱的油轮船体形式的滚动和升沉的实验数据进行比较。

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