Abstract
The predictive capability of transport equation-based cavitation models including the Kubota cavitation model (Model-1) and interfacial dynamics cavitation model (Model-2), is evaluated for the attached turbulent cavitating flows. In this study, the test problem is the unsteady cloud cavitating flows around a Clark-Y hydrofoil. Based on the evaluations of existing models, we identified the differences between these two vaporization and condensation processes in the affected region, and provided a modified density based cavitation model (Model-3). The numerical results of the cavity shapes, velocity distributions and dynamics of the cavity oscillations were compared to existing experimental data. Compared with the other cavitation models, a significant improvement for the numerical results of unsteady cavitating flows has been obtained with the new model. Our study provides the information for further modeling development.
Highlights
The predictive capability of transport equation-based cavitation models including the Kubota cavitation model (Model-1) and interfacial dynamics cavitation model (Model-2), is evaluated for the attached turbulent cavitating flows
Different transport equation-based cavitation models from the literature are summarized below and a modified density based cavitation model using the unsteady characteristics of cavitating flow is developed
The set of governing equations employed in this study consists of the conservative form of the Reynolds averaged Navier-Stokes equations, plus a volume fraction transport equation to account for the cavitation dynamics, and the turbulence closure
Summary
Navier-Stokes computations of turbulent cavitating flows have been progressively adopted because of advances in computational capabilities and understanding of the physics of these problems These issues pose challenges with respect to accuracy, stability, efficiency and robustness because of the complex unsteady interaction associated with cavitation dynamics and turbulence. Turbulence cavitating flow computations need to address cavitation modeling issues because, phenomenologically, cavitation often involves complex phase-change dynamics. Until now, these physical mechanisms were not well understood because of the complex cavitating flow structures. Different transport equation-based cavitation models from the literature are summarized below and a modified density based cavitation model using the unsteady characteristics of cavitating flow is developed. This study provides the useful information for further modeling modifications
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