SPH方法的孤立波与部分淹没结构物相互作用数值计算研究

Study on the interaction between solitary waves and the non-submerged marine structures based on the SPH model

为研究孤立波作用下结构物周围流场特征,基于无网格SPH方法,建立孤立波与海洋结构物相互作用模型,对不同波幅孤立波作用下部分淹没矩形结构物周围波面、流速、涡量及结构受力特征进行计算分析,探索了相对波高对非淹没结构物周围流场的影响规律。结果表明:流场特征与相对波高密切相关,相对波高较小时,波面、流速、涡量及结构荷载均较为光滑,相对波高在0.2以上时,波峰爬升至结构物顶部并在越过结构物后与水槽内水体碰撞造成流场波动,波面、流速、涡量及结构荷载的波动幅度随着相对波高增大而增大,流场更加复杂,结构物水平和垂向负压也越大,且结构物周围涡分布逐渐向深度方向和下游方向发展。

To investigate the characteristics of the flow field around non-submerged structures under solitary waves,a numerical model of the interaction between solitary waves and marine structures is established based on the meshless SPH method.By calculating and analyzing the characteristics of the wave surface,velocity,vorticity,and structure force under different amplitude solitary waves,the influence of relative wave height on the flow field around the non-submerged structure was explored.The results show that the flow field characteristics are closely re-lated to the relative wave height.With a little relative wave height,the wave surface,velocity,vorticity,and struc-ture force are smooth while the flow field fluctuate around the structure due to that the wave crest climbs to the top of the structure and collide with the water in the tank after passing the structure when the relative wave height is large than 0.2.The fluctuation amplitude of wave surface,velocity,vorticity and structure force increased with the increase of relative wave height,resulting in a more complex flow field.Meanwhile,the horizontal and vertical neg-ative force of the structure are larger,the distribution of vorticity around the structure gradually develops to the depth and downstream direction.