A numerical study of unsteady cavitation on a hydrofoil by LES and URANS method

9th International Symposium on Cavitation

Li, Zi-Ru^1 ; Zhang, Guang-Ming^1 ; He, Wei^1 ; Van Terwisga, Tom^2,3

Wuhan University of Technology, Wuhan, Hubei

430063, China^1

Delft University of Technology, Delft

2628 CD, Netherlands^2

Maritime Research Institute Netherlands, Wageningen

6700 AA, Netherlands^3

关键词: Cavity length;    K-Omega turbulence model;    Large scale structures;    Quantitative agreement;    Single-fluid approach;    Unsteady cavitation;    Unsteady reynolds-averaged navier-stokes methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012157/pdf
DOI  :  10.1088/1742-6596/656/1/012157

来源: IOP

【 摘 要 】

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.