A Hybrid GFDM-SBM Solver for Acoustic Radiation and Propagation of Thin Plate Structure Under Shallow Sea Environment

This paper makes the first attempt to propose a novel hybrid collocation solver based on the generalized finite difference method (GFDM) and singular boundary method (SBM) to analyze underwater acoustic radiation and propagation around the thin plate structures excited by simple harmonic force under shallow sea environment. In the proposed hybrid solver, the meshless GFDM is employed to obtain the fluid-structure coupling vibration response of thin plate structure, and then the SBM with Pekeris waveguide Green function is used to calculate the external acoustic field of thin plate structure. The simplified Price-Wu boundary condition is adopted on the surface of plate structure to connect the computational domains between the GFDM and SBM. Three benchmark examples are carried out to demonstrate the accuracy and efficiency of the proposed hybrid GFDM-SBM solver in comparison with the COMSOL simulation for computing underwater acoustic wave fields around the thin plate structures under shallow sea environment.