Cavitation in an Elastic Liquid

The response of rigid plates to blast in deep water: fluid–structure interaction experiments

“…In doing so, we shall also provide experimental evidence supporting the theoretical findings of Kennard (1943) in the case of blast loading; this will be achieved by direct observation of the cavitation processes and structural response by high-speed photography. The experimental results will also be used to validate the predictions of the theoretical models by Schiffer et al (in press).…”

“…Understanding of cavitation is paramount when studying FSI in underwater blast events. Theoretical work by Kennard (1943) provided great insight into this; he found that when the pressure drops below the cavitation limit at a point in a liquid, 'breaking fronts' emerge from this point and propagate outwards, forming an expanding region of cavitated liquid. Subsequently, subject to certain conditions, such breaking fronts can arrest, invert their motion and become 'closing fronts', reducing the volume of cavitated fluid.…”

The response of circular composite plates to underwater blast: Experiments and modelling

“…3a, reaches the wet surface of the specimen. Figure 3b shows that, soon after the plate has started to deform, cavitation bubbles appear in the water at a distance 150 m m c z  from the fluid-structure interface, and two breaking fronts (BF) emerge and propagate in opposite directions at supersonic speed, forming an extending pool of cavitated water, as predicted by Kennard (1943). In Fig.…”

“…Great insight into the cavitation process triggered by pressure waves propagating in a bi-linear elastic fluid is given in Kennard (1943). He found that cavitation zones spread by propagation of a 'breaking front' (BF) emanating from the point of first cavitation and forming an expanding pool of cavitated fluid.…”

“…3c). Since the CF always propagates at subsonic speed (Kennard, 1943), the wave train emanated from the fluid-structure interface will approach the CF and eventually reflect back to the fluid-structure interface as a positive pressure pulse, resulting in additional loading of the plate at a later time, see Fig. 4b.…”