Abstract
The periodic shedding of cloud cavitation has been previously assumed to be induced primarily by re-entrant jet based on considerable experimental and numerical studies. However, different shedding mechanisms, including that induced by pressure waves, have recently regained research interest. To conduct a corresponding numerical investigation, the cavitating flow around an axisymmetric projectile is studied using a user-designed solver that considers the compressibility of the three phases and phase change within the OpenFOAM ® framework. Results are compared with those of an experimental study based on Split Hopkinson Pressure Bar (SHPB) technology with high-speed photography. Good agreement on cavity morphology is confirmed between the results. During the first period, a typical re-entrant jet-induced shedding mechanism is observed as the re-entrant jet front coincides with cavity closure. By contrast, their evident separation is noted in the second period, and cavity closure is located in a counterflow area caused by the impact of pressure waves that are radiated by the collapse of a shedding cavity and propagate in liquid water. This observation is never predicted by an incompressible solver used for comparison, thereby indicating that the existence of a different shedding mechanism is highly relevant to compressibility.
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