ABSTRACT
This paper presents the numerical simulation of the dynamic response of a long-span submerged floating tunnel under wave action. A numerical model for solving the motion of an elliptical cross-section tunnel is established using the commercial software Ansys. The tunnel structure is simulated using multi-point constrained beam elements, and the wave loads are computed using the Morison equation. The hydrodynamic coefficients of the elliptical cross-section are determined using a three-dimensional FDM-VBF-VOF hydrodynamic model that captures the effects of cross-sectional shape. The numerical calculations were conducted to analyze the motion response characteristics of the submerged floating tunnel under the action of different incident wave periods and wave heights. The numerical results indicate a significant correlation between the amplitude of tunnel motion and the structural natural frequency: the closer the incident wave frequency to the structural natural frequency, the greater the amplitude of structural motion.
