Finite Amplitude Propagation of an Underwater Explosion Shock Wave Out to a Convergence-Zone Caustic
NAVAL ORDNANCE LAB WHITE OAK MD
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The effect of wave overtaking on the peak pressure of refracted underwater explosion shock waves is estimated by a method-0f-characteristics calculation. The results show that considerably greater attenuation of the peak pressure occurs as a shock wave travels out to a convergence-zone caustic in the ocean than is experienced by a non-refracted shock wave traveling the same distance. Depending on the explosion conditions, taking account of this additional attenuation can reduce the predicted peak pressure in the vicinity of the caustic by as much as 30. The report provides a simple method for estimating this effect for particular conditions using routinely available output data from ray tracing programs.