Abstract
Numerical simulations of underwater vehicle wake flow field and propeller excitation force were performed to evaluate the performance of the k-ω SST RANS and k-ω IDDES turbulence models. First, the nominal wake of the SUBOFF model and open water characteristics of the INSEAN E1619 propeller were compared to the experimental measurements to validate the numerical method. Then, the flow field around the SUBOFF model fitted with the INSEAN E1619 propeller was simulated at the self-propulsion point by RANS and DES turbulence models, respectively. Finally, the time histories of the predicted propeller load and corresponding frequency spectra were compared between these two turbulence models to reveal their differences. It is found that the RANS model can successfully capture the main flow field features and predict the mean propeller loads. The DES model was able to simulate the wake flow field with much more useful details and predict the propeller loads with much larger fluctuations than RANS. The fluctuation of blade hydrodynamic loads is highly correlated with the wake turbulence intensity. In addition, it is found that the phase-averaged evolution course of the propeller force predicted by the DES model is almost the same as that directly predicted by the RANS model.
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Acknowledgements
The present work is supported by the National Natural Science of China (Grant No. 52001043, 51639003, 51279030, 51709042, 52061135107), the Fundamental Research Funds for the Central Universities (DUT20TD108, DUT20LAB308); and the Liao Ning Revitalization Talents Program (XLYC1908027). The authors would like to thank their support.
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Jiang, Y., Li, Y., Wu, C. et al. Assessment of RANS and DES turbulence models for the underwater vehicle wake flow field and propeller excitation force. J Mar Sci Technol 27, 226–244 (2022). https://doi.org/10.1007/s00773-021-00828-8
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DOI: https://doi.org/10.1007/s00773-021-00828-8