Typically, underwater implosion is a concern only at deep depths where there is significant hydrostaticpressure. At shallow depths, there is much less potential energy in an implodable volume since there islittle pressure to drive the implosion. However, a shallow implosion can be amplified if it is initiated by anearby underwater explosion (UNDEX). The overpressure from the UNDEX shock wave can accelerate thecollapse and produce a significant implosion pressure pulse, even at shallow depth. An additional factorcontrolling the resulting implosion pressure pulse is whether the implodable volume is in a free‐field orconfined by surrounding structure. Confining structure affects water flow around the collapsing volume,and can significantly alter the implosion pressure pulse. The presentation will cover a specific case ofshallow, UNDEX initiated, confined implosion. Detailed simulations of the case will be presented andcompared to the experiments. Differences between the two will be discussed.
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