Numerical investigation of shedding partial cavities over a sharp wedge

9th International Symposium on Cavitation

Budich, B.^1 ; Neuner, S.^1 ; Schmidt, S.J.^1 ; Adams, N.A.^1

Institute of Aerodynamics and Fluid Mechanics, Department of Mechanical Engineering, Technische Universität München, Boltzmannstr. 15, Garching b. München

D-85748, Germany^1

关键词: Analytical relations;    Barotropic flows;    Homogeneous mixtures;    Horseshoe vortices;    Numerical approaches;    Numerical investigations;    Thermodynamic equilibria;    Transient dynamics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012122/pdf
DOI  :  10.1088/1742-6596/656/1/012122

来源: IOP

【 摘 要 】

In this contribution, we examine transient dynamics and cavitation patterns of periodically shedding partial cavities by numerical simulations. The investigation reproduces reference experiments of the cavitating flow over a sharp wedge. Utilizing a homogeneous mixture model, full compressibility of the two-phase flow of water and water vapor is taken into account by the numerical method. We focus on inertia-dominated mechanisms, thus modeling the flow as inviscid. Based on the assumptions of thermodynamic equilibrium and barotropic flow, the thermodynamic properties are computed from closed-form analytical relations. Emphasis is put on a validation of the employed numerical approach. We demonstrate that computed shedding dynamics are in agreement with the references. Complex flow features observed in the experiments, including cavitating hairpin and horse-shoe vortices, are also predicted by the simulations. Furthermore, a condensation discontinuity occurring during the collapse phase at the trailing portion of the partial cavity is equally obtained.