The mass, stiffness, and wetted hull shape are used to create a finite element beam model of a surface ship. Acoustic fluid brick elements are included near the hull to account for any local cavitation that may occur and a DAA (Doubly Asymptotic Approximation) boundary is placed on the outer surface of the region modeled with these brick elements. A series of underwater explosions are then run using the DYNA3D and USA codes to evaluate the hull whipping response due to varying shock wave front curvatures. These are compared with the whipping responses from the bubble dynamics calculated by a modal whipping code.
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