Abstract
The objective of this study is to propose a modified method for the cavitation model and turbulence model, accounting for the influence of vortex motion on unsteady cavitating flows. A function of the ratio of strain rate tensor and rotation rate tensor is introduced into the Zwart cavitation model and the shear stress transfer (SST) γ-Reθt turbulence model respectively. The modified method is applied to simulate the unsteady cloud cavitating flow around Clark-Y hydrofoil and evaluated by the experimental data. The results show that the modified model can better capture the unsteady process of the cloud cavity, especially the fully developed attached cavity and the large-scale cloud shedding behaviors. These benefit from the increase of turbulent dissipation rate per unit energy and the evaporation rate of the modified method. In addition, the lift coefficient fluctuation in time and the time-averaged u-velocity profiles predicted by the modified model are better agreement with the experimental results.
摘要
本研究的目的是考虑旋涡运动对非定常空化流动的影响, 提出了一种空化模型和湍流模型的修正方法. 在Zwart空化模型和 SST γ-Reθt湍流模型中分别引入了由应变率张量和旋转率张量之比构建的函数. 将该修正方法用于模拟绕Clark-Y水翼的非定常云空化 流动, 并通过与实验数据对比进行评估. 研究结果表明, 修正模型能够更好地捕捉到云空化的非定常过程, 特别是充分发展的附着空穴 和大尺度的云空泡脱落行为. 这都得益于修正方法中单位能量的湍流耗散率和蒸发率的提高. 此外, 修正模型所预测的升力系数随时 间的波动和时均流向速度分布与实验结果有较好的一致性.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 52076108).
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Bojie Hong established the numerical method, made reasonable analysis and wrote the first draft of the manuscript. Changli Hu set the overall research goals, supervised the research activity execution and the final version revision. Haojie Xing helped process data and organize the manuscript.
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Hong, B., Hu, C. & Xing, H. A modified method considering vortex effect for modelling unsteady cavitating flows. Acta Mech. Sin. 39, 322399 (2023). https://doi.org/10.1007/s10409-022-22399-x
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DOI: https://doi.org/10.1007/s10409-022-22399-x