A Study of Fluid-Structure Interaction and Decoupling Approximations.

摘要

To analyze the effect of an underwater explosion on submarine appendages,it is necessary to account for the presence of the surrounding fluid. One of the pressure loadings exerted by the fluid on the appendage will be due to its motion through the fluid. For most bodies,it is difficult to compute the resultant force due to this fluid loading. The force exerted on an object moving in an acoustic medium can be related to its acceleration through a convolution integral;the kernel of this integral represents the impulsive force which results when the body is given a step velocity change. The sphere is one of the few geometries for which an analytic expression for this impulsive pressure exists. For more complicated bodies,various approximations for impulse force have been proposed,based on its known assymptotic early and late time behavior. (Modified author abstract)