基于无网格法的浮体与波浪相互作用模拟与试验验证

浮体在波浪中的运动现象广泛存在于海洋石油及新能源领域,属于流固耦合问题,同时涉及自由表面流动和运动边界等复杂现象,使得基于欧拉模式的数值方法并不擅长该类问题的求解。采用一种拉格朗日无网格法,即光滑粒子动力学(SPH)方法,建立流固耦合数值计算模型,模拟浮体在波浪水槽中的运动过程,通过线性波浪理论和水槽试验验证了模型的准确性。结果表明:SPH方法能够有效模拟浮体在波浪作用下的非定常运动,并且捕捉到越浪、浮体侧倾等现象,预测的浮体位移时间关系与试验结果一致;在无约束条件下,浮体在水槽中发生横向位移,且位移受浮体形状和尺寸影响较大。

Simulation and experimental validation of wave-floating body interaction based on meshless method

Floating body motion in waves widely exists in the field of offshore oil and new energy.It belongs to the fluid-solid coupling problem,and involves complex phenomena such as the free surface flow and moving boundary.Therefore,the numerical methods based on Euler model are not suitable to solve such problems.A Lagrangian meshless method,i.e.the smoothed particle hydrodynamics(SPH)method,was used to establish a fluid-solid coupling numerical model to simulate the motion of a floating body in a wave tank.The prediction accuracy of the model was verified by the linear wave theory and wave-tank experiments.The results show that the SPH method can effectively simulate the unsteady motion of the floating body under the action of waves,and capture the phenomena of overtopping and lateral displacement of the floating body.The predicted relationship between the body displacement and time is consistent with the experimental results.Due to the unconstrained condition of the body movement,the lateral displacement of the floating body occurs in the wave tank,and the displacement is greatly affected by the shape and size of the floating body.