As an effective method to control shock initiation of the explosive, we have tried application of underwater shock wave In this study the mass, momentum and energy conservation equations, and the reaction rate law of explosive were solved by finite difference method. First, to examine the exactness of the computer code, a 1-dimensional shock initiation process was calculated. Subsequently, the numerical simulations were performed on the cylindrical and conical apparatuses, which were filled with water between donor and accepter explosives. The aim of using these apparatuses is to generate ultra-high pressure on the axis of accepter explosive. The interval of donor and accepter explosives was varied how the different intervals affect on the results of numerical calculation. Finally, it was found that the conical apparatus gave better results than cylindrical apparatus.
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