Abstract
In the current paper, Large Eddy Simulation on the confined tip leakage cavitating flow generated by a straight NACA0009 hydrofoil with a clearance size gap = 10 mm is performed. TLV cavitation and TSV cavitation are reasonably captured. Different vortex identification methods of all three generations, including vorticity, Q-criterion, Ω method and Liutex method are compared in detail with the simulated tip leakage cavitating results. It is observed that the Ω method and the Liutex method, show advantages in visualizing vortical structures in the currently studied flow regime with a strong capability in filtering out shearing contaminations. Both Liutex vector field and Liutex iso-surface show potentials in investigating vortical cavitating flow. Differences of cavitating and non-cavitating tip vortices mainly lie in their sizes and the generation of small-scale vortices around the TSV, which indicates the effect of cavitation.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Project nos. 51822903, 11772239, and 11772305). The numerical calculations in this paper were done on the supercomputing system in the Supercomputing Center of Wuhan University.
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Bai, X., Cheng, H., Ji, B. (2021). On the Comparison of Liutex Method with Other Vortex Identification Methods in a Confined Tip-Leakage Cavitating Flow. In: Liu, C., Wang, Y. (eds) Liutex and Third Generation of Vortex Definition and Identification. Springer, Cham. https://doi.org/10.1007/978-3-030-70217-5_8
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DOI: https://doi.org/10.1007/978-3-030-70217-5_8
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