A method for determining mesh size in numerical simulation of shock wave from underwater explosion

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (8) : 93-100.

ZHANG Sherong1，LI Hongbi1，WANG Gaohui1，2KONG Yuan1

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Abstract

The numerical simulation accuracy of underwater explosion shock wave propagation well depends on the mesh size, and the acceptable mesh size varies with the charge weight. Through analyzing the mesh size effect at different scaled distances of shock wave peak pressure and impulse, with the explosive radius and the grid size ratio as a criterion for determining mesh size, a mesh size determining method which is suitable for various charge weights was proposed. And according to the error analysis of numerical results, if taking one third of the explosive radius as the mesh size, the numerical accuracy can meet the requirements of engineering. In addition, through nonlinear fitting of numerical simulation errors, the error estimation formulas of peak pressure and impulse were put forward. These error estimation formulas can play a strong guiding role for researchers in selecting an appropriate mesh size according to the charge weight and the acceptable error range or estimating the accuracy of numerical results.

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/ mesh size effect；peak pressure；impulse；charge weight；scaled distance

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ZHANG Sherong1，LI Hongbi1，WANG Gaohui1，2KONG Yuan1. A method for determining mesh size in numerical simulation of shock wave from underwater explosion[J]. Journal of Vibration and Shock, 2015, 34(8): 93-100

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