EXPERIMENTAL AND NUMERICAL SIMULATION OF STRUCTURE / WATER IMPACT

摘要

This paper describes the numerical modeling of the impact of a rigid hemispherical structure upon water, using LS-DYNA [1] explicit dynamics software, and the validation of the modeling by comparison with theory and experiment. Firstly a theoretical solution, based upon conservation of momentum, is presented for the acceleration of a rigid spherically based capsule during vertical impact upon water. Next the design of a vertical water impact test rig is described and preliminary results for a 3.6m/s impact are presented. Finally the numerical analysis methodology used in LS DYNA is explained and then applied to simulate the 3.6m/s vertical impact experiment. The simulation results are compared to the experiment and theory, showing reasonable agreement. The discrepancies in the results are discussed in detail and further work in this area is suggested.