Abstract:Numerical simulation of TNT underwater explosion was carried out with AUTODYN software. Influences of artificial viscosity and mesh density on simulation results were discussed. Detonation waves in explosive and shock wave in water during early time of explosion are high frequency waves. Fine meshes (less than 1,mm) in explosive and water nearby, and small linear viscosity coefficients and quadratic viscosity coefficients (0.02 and 0.1 respectively, 1/10 of default values) are needed in numerical simulation model. According to these rules, numerical computing pressure profiles can match well with those calculated by Zamyshlyayev empirical formula. Otherwise peak pressure would be smeared off and upstream relative errors would be cumulated downstream to make downstream peak pressure lower.Underwater explosion loads are important for antiblast design and analysis of naval ships. They are also input parameters for shock response analysis of naval ship structures and equipments. Precision description of underwater explosion loads affects the accuracy of vulnerability analysis directly. Many research results show that many numerical softwares in varying degrees, such as ALE3D, DYSMAS, DYTRAN, CTH, LS-DYNA, etc, have underestimated the peak pressure of shock wave. In order to approach peak pressure in far field underwater explosion calculated by empirical formula, Zhang et al [1] and Fang et al [2] promote significant parameters of equation of state for water while simulating TNT underwater explosion with DYTRAN software.
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