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为了解决流固耦合问题中的物体大幅度运动带来的困难,采用ALE(Arbitrary Lagrange-Euler)动网格方法跟踪自由表面上浮体的运动。计算表明:浮体在无粘流体中的垂荡与弹簧-物体的振动模型理论解符合得较好;浮体在粘性流体中的自由横摇为阻尼运动,其横摇角度随时间的增加而减小,且在不同初始角度下运动系统的固有周期相当。在有外力力矩激励时,外力力矩的周期与系统的固有周期相当时浮体横摇运动趋于共振状态,运动幅度最大。计算结果验证了计算程序的可靠性与精度。本文方法为ALE方法应用于流体-多浮体耦合运动分析奠定了基础。
In order to solve the problem of large-scale object movement in the fluid-solid coupling problem, the ALE (Arbitrary Lagrange-Euler) moving grid method is used to track the movement of a floating body on a free surface. The calculation results show that the heave of the floating body in the non-viscous fluid conforms well to the theoretical solution of the spring-object vibration model. The free-rolling of the floating body in the viscous fluid is a damping motion and its roll angle decreases with time , And the same natural period of motion system under different initial angles. When there is moment of external force excitation, when the period of external moment is equal to the natural period of the system, the floating motion of the floating body tends to be in the state of resonance with the largest amplitude of motion. The calculation results verify the reliability and accuracy of the calculation program. The method of this paper lays the foundation for the ALE method to be applied to the fluid-multi-floating coupled motion analysis.