Abstract
In this paper, the unsteady cavitation phenomena on a NACA0015 hydrofoil is numerically simulated by unsteady Reynolds-Averaged Navier-Stokes (URANS) method and Large Eddy Simulation (LES) in single-fluid approaches to multiphase modelling, respectively. It is observed that the large-scale structures and characteristic periodic shedding predicted by the URANS with the modified SST k-ω turbulence model show a good qualitative match with the experimental observations but with quantitative discrepancies, such as a different cavity length and volume, and a different location of shedding. Compared to the URANS results, the LES results reproduce more details of unsteady dynamics with an improved quantitative agreement.
Highlights
Cavitation is a complex physical phenomenon of phase change from liquid to vapor at almost constant temperature in regions where the pressure is lower than a certain critical pressure
As one of the remarkable catastrophic consequences, cavitation erosion is a great challenge to be assessed since it involves multi-scale hydrodynamic processes in combination with the response of solid material exposed to various cavitation regimes
From a number of experimental studies, it is confirmed that a crucial phase in the process leading to cavitation erosion is the break-up of the macroscopic sheet cavity into cloudy cavities [5,6,7]
Summary
Cavitation is a complex physical phenomenon of phase change from liquid to vapor at almost constant temperature in regions where the pressure is lower than a certain critical pressure. It commonly occurs in marine propulsion systems and other hydraulic machinery. Additional difficulties arise in the numerical modelling of unsteady cavitation phenomena due to the complex mechanism involving turbulent fluctuations over a wide range of length and time scales. Simulation of the cavitating flow around the NACA0015 hydrofoil through the URANS method using a modified SST k-ω turbulence model. 2. Numerical Modelling The governing equations for the liquid/vapor two-phase flow are based on a single-fluid approach. The experiments to be compared with the numerical simulations are performed by MARIN in cooperation with Lloyd’s Register [7,13]
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