流体域特性对流固耦合振动计算的影响

摘要

Prediction of the coupled vibration from underwater structure is a key problem, FEM becomes a effective method to solve fluid-structure coupling vibration of complex ship by the developing of computer technology. Fluid-structure coupling vibration model of a typic cylinder shell was established based on fluid-structure interaction in this paper. The influence of fluid boundary, fluid figure, fluid area and meshing method to the calculation was analysed. Then, a reasonable method of modeling was brought forward. This paper can give a useful example for predicting coupled vibration behavior of underwater sructure.%船舶结构的水下振动预报一直受到广泛的重视，计算机技术的发展使得有限元法成为求解复杂船舶结构流振耦合振动的有效方法。本文基于船体结构与周围流体介质的耦合作用建立典型圆柱壳流固耦合振动计算的有限元模型，重点分析流体域边界处理方式、流体域形状、流体域范围对耦合振动计算结果的影响，提出合理的流体域建模方法。同时分析流体网格控制方式对于耦合振动计算的影响，为水下结构物耦合振动分析提供参考。