Gas entrainment from gaseous supercavities: Insight based on numerical simulation

OCEAN ENGINEERING

卷:221

Article

Kinzel, Michael P.¹  Lindau, Jules W.^2,3  Kunz, Robert F.^3,4 

[1] Univ Cent Florida, Orlando, FL 32816 USA

[2] Penn State Univ, Appl Res Lab, University Pk, PA 16802 USA

[3] Penn State Univ, Dept Aerosp Engn, University Pk, PA 16802 USA

[4] Penn State Univ, Dept Mech Engn, University Pk, PA 16802 USA

关键词: Supercavitation;    Ventilation;    Turbulence;    Multiphase CFD;   

DOI  :  10.1016/j.oceaneng.2020.108544

来源: Elsevier

【 摘 要 】

The understanding of the internal gaseous flow of artificially ventilated supercavities is developed using a locally homogenous, multiphase computational fluid dynamics model that is benchmarked using experimental data. The solutions indicate that gas leakage from a ventilated supercavity originates from the gaseous shear layers forming at the gas-water interface. Not only do these observations corroborate previous theory developed for cavities with toroidal closure, they also display evidence that shear-layer mechanisms remain important for cavities in the twin-vortex regime and when interacting with bodies. It is also found that the treatment of turbulence in these shear layers affects the outcome of computational fluid dynamics approaches. Lastly, a semi-empirical model considering these shear layers is proposed. Results from the model indicate an improved prediction capability of the relationship between cavity size and ventilation rate for steady, twin-vortex supercavities.

【 授权许可】

Free