Predicting dynamic characteristics of a submerged vertical cylinder in the wide-frequency domain based on the wavelet fluid-solid interaction method (WFSIM)

Due to the huge computational cost and dispersion errors, wide-frequency and fluid-structure interaction dynamic analysis of submerged cylindrical shells is difficult to carry out in the design phase. To solve this problem, the wavelet fluid-solid interaction method (WFSIM) is proposed in this paper to avoid the huge computational cost and dispersion errors when predicting the dynamic characteristics of submerged vertical cylinders in a wide-frequency domain. For this purpose, the formulas of the wavelet fluid-solid coupling algorithm to couple the wavelet finite element method and the theory of fluid-structure interaction are derived and introduced carefully first. Then, the formulas to build the numerical model of submerged vertical cylinders are given and introduced in this paper. To verify the effectiveness and efficiency of the proposed method, an experimental study is adopted for predicting the dynamic characteristics of the scaling model of a submarine cabin in a wide-frequency domain. The experimental results indicate that the WFSIM can be adopted for predicting the dynamic characteristics of submerged vertical cylinders in the wide-frequency domain within a few seconds and that the relative errors are less than 10%. Additionally, the wavelet fluid-solid coupling algorithm can also be introduced to model other submerged vertical cylinders for predicting the dynamic characteristics in the wide-frequency domain.