缆索连接水面和水下二维双浮体系统流固耦合动力学分析

Dynamic analysis of fluid solid interaction on two-dimensional system with the floating body and submerged body connected by hawser

针对由缆索连接的水面和水下二维双浮体系统,该文研究了其在线性规则波浪载荷作用下的流固耦合动力学特性。首先,描述了包含有动边界的浮体系统流场数学模型及其控制方程,基于ADINA软件仿真平台并采用速度边界造波法建立了数值波浪水槽,采用ADINA-FSI分析模块计算了波浪与浮体系统的流固耦合动力学响应。在此基础上,讨论了缆索密度、弹性模量以及浮体相对几何尺寸对系统水动力学特性的影响,获得系统动力学响应过程中缆索的应力状态和浮体的位姿状态及其水动力学性能。计算结果对研究海洋工程领域中由缆索连接的柔性不完全约束多浮体系统动力学行为具有重要的工程意义。

In view of two-dimensional double floating body system with the floating body and submerged body connected by hawser, the dynamic characteristics of fluid-solid interaction are studied under regular waves. Firstly, mathematical models and dynamics control equations on the flow field with moving boundary are described. Numerical wave channel is set up based on velocity boundary wave method on the platfrom of ADINA software. Fluid-structure interaction response of floating body system and waves is solved by the means of ADINA-FSI analysis module. On this basis, the influences of cable density, elastic modulus and relative geometric size of floating body on the hydrodynamic characteristics of the system are discussed. And the stress state of the hawser, the posture state of the floating body and the hydrodynamic force of the floating body are obtained during the dynamic response process. The results are of great engineering significance for studying the dynamic behavior of the multi constrained floating system with flexible connections, such as hawsers, etc. in the field of marine engineering.