When high-velocity projectiles penetrate an enclosed fluid-filled structure, the projectiles transfer the kinetic energy to the surrounding structure through the fluid and cause excessive structural damage. This process is referred to as a hydrodynamic ram (HRAM) [1]. The HRAM can be divided into five phases[l]: penetration, shock, drag, exit, and cavity oscillation. The HRAM phenomenon has been studied analytically [2,3], experimentally [4-7] and numerically [8-10]. However, few studies have been performed on the hydrodynamic ram caused by multiple penetrators. In the present work, a previously validated numerical model was used to analyze the differences of hydrodynamic rams caused by one and two projectiles impacting water-filled containers.
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