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Abstract
The unsteady features of supercavitation disturbed by an introduced pressure wave are investigated numerically using a one-fluid cavitation model. The supercavitating flow is assumed to be the homogeneous mixture of liquid and vapour which are locally under both kinetic and thermodynamic equilibrium. The compressibility effects of liquid water are taken into account to model the propagation of pressure wave through flow and its interaction with supercavitation bubble. The interaction between supercavity enveloping an underwater flat-nose cylinder and pressure wave is simulated and the resulting unsteady behavior of supercavitation is illustrated. It is observed that the supercavity will become unstable under the impact of the pressure wave and may collapse locally, which depends on the strength of perturbation. The huge pressure surge accompanying the collapse of supercavitation may cause the material erosion, noise, vibration and efficiency loss of operating underwater devices.
Highlights
Cavitation widely exists in a large variety of engineering applications and is an important consideration in the design of hydraulic machinery
A source term is added to the transfer equation to account for the rate of phase change between two phases, which, is constructed on the basis of theory of bubble dynamics
With this kind of model, the flow is treated as incompressible. This type of method has been applied to a wide range of cavitating flow computations and is found to be able to qualitatively reproduce prominent flow features observed in experiment and produce results that quantitatively agree with theoretical model prediction and experimental data. Another widely used approach is based on the single-fluid consideration with appropriate equation of state (EOS) established for both liquid flow and cavitation region
Summary
Cavitation widely exists in a large variety of engineering applications and is an important consideration in the design of hydraulic machinery. How to construct cavitation models to accurately describe the dynamic phase change between This is an Open Access article published by World Scientific Publishing Company. A source term is added to the transfer equation to account for the rate of phase change between two phases, which, is constructed on the basis of theory of bubble dynamics With this kind of model, the flow is treated as incompressible. This type of method has been applied to a wide range of cavitating flow computations and is found to be able to qualitatively reproduce prominent flow features observed in experiment and produce results that quantitatively agree with theoretical model prediction and experimental data Another widely used approach is based on the single-fluid consideration with appropriate equation of state (EOS) established for both liquid flow and cavitation region. It is hoped that this study can shed some light into the understanding of transient supercavitation behavior
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