The whipping response of a fluid filled cylindrical shell subjected to an underwater explosion

Abstract

Fluid filled structure widely exists in the field of ship and ocean engineering, but the investigation concerned with the whipping response of a fluid filled structure subjected to an underwater explosion is very less. A numerical model considering the effect of an internal fluid is established in this paper. In the implementation of the numerical model, the doubly asymptotic approximation for the external fluid is used to model the external fluid domain, the doubly asymptotic approximation for the internal fluid is used to model the internal fluid domain, and the dynamic response of the structure is simulated by the finite element method. After that, the numerical model is validated against the analytical solution. The numerical result agrees well with the analytical result. Finally, the whipping response of a fluid filled cylindrical shell subjected to an underwater explosion is investigated and the influence of the internal fluid on the whipping response is analyzed. The main results are as follows. The existence of the internal fluid makes the maximum relative displacement decrease, as the density of the internal fluid and the sound speed within the internal fluid increase, the maximum of the maximum relative displacement decreases.