中文摘要：

通过ANSYS软件建立2个同心圆柱壳以及在同心圆柱壳之间的静水模型,对其流固耦合模态特性进行分析。对圆柱壳和静水分别采用Solsh190和Fluid30单元进行网格划分,忽略流体的粘性和可压缩性的影响,通过有限元计算得到同心圆柱壳之间含静水的流固耦合模型的固有频率,分析静水间隙对其固有频率的影响。计算结果表明,随着静水间隙减小,固有频率亦随之减小;用ANSYS Fluid30模拟小间隙静水,间隙g≥1.5 mm且动能雷诺数Rk≥1478时,计算结果误差小于20%。

英文摘要：

The fluid-structure interaction analysis of the vibratory modal characteristics of a vertical thin-walled cylindrical shell containing water, in an adjacent coaxial region is presented by ANSYS software. The cylindrical shells were modeled by 3D solid shell elements （Solshl90） and the fluid was modeled by 3D fluid elements （Fluid30）. The influence of the fluid viscosity and compressibility are negligible. The natural frequency of cylindrical shell and inner rigid shell separated by the fluid annulus, is obtained by finite element method. The results show that with the decreasing of fluid annulus gap, the natural frequency decreases. When simulation with ANSYS Fluid 30, the fluid annulus gap g≥ 1.5 mm and the Reynolds number Rk≥ 1478, the calculation error is less than 20%.