Advancement and Application of Multi-Phase CFD Modeling to High Speed Supercavitating Flows
Final rept. Oct 2008-Dec 2013
PENNSYLVANIA STATE UNIV STATE COLLEGE APPLIED RESEARCH LAB
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In this work, we present insight on the internal gaseous flow of artificially ventilated supercavities. Using multiphase computational fluid dynamics, the major mechanism of gas leakage from a ventilated supercavity is identified as occurring though gaseous shear layers forming at the gas-water interface. These observations corroborate previous theory developed for toroidal cavities, and display evidence that shear-layer mechanisms remain important for twin-vortex cavities and cavities interacting with bodies. Additionally, shear mechanisms appear to influence cavity hysteresis behavior. These observations are used to guide improved supercavitating-vehicle analyses including numerical predictions, experiments, and modeling.
- Fluid Mechanics