Numerical study on the dynamic response of liquid-filled closed hollow cylinder under water impact

Abstract

The water entry phenomenon of cavity structures is widespread in marine equipment applications, making the study of their impact dynamic response is crucial and valuable. However, the impact response of closed cavity structures filled with liquid entering water is not well understood. The arbitrary Eulerian–Lagrangian (ALE) algorithm and penalty function method were used to simulate the fluid–solid coupling process of a closed hollow cylinder filled with liquid. The accuracy and feasibility of simulating the water impacts of structures based on the ALE algorithm were verified. The water entry characteristics of the closed hollow cylinder with different filling ratios and multiple initial vertical velocities were studied. The results showed that the motion parameters of the hollow cylinder with and without liquid filling were significantly different. The closed hollow cylinder in the liquid-filled state could alleviate the deformation of the head, but in the fully liquid-filled state, it aggravated the deformation of the tail.