Large Eddy Simulation Study on the Relationship Between Large-Scale Turbulence Vortices and Unsteady Cavitation Around a Hydrofoil
Large Eddy Simulation Study on the Relationship Between Large-Scale Turbulence Vortices and Unsteady Cavitation Around a Hydrofoil
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水翼周围大尺度湍流涡与非定常空化关系的大涡模拟研究
DOI：
10.1115/1.4056525
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Kajishima Takeo
中科院分区：
文献类型：
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作者：
Okabayashi Kie;Furukawa Ayumu;Otsu Takeshi;Kajishima Takeo
本文采用大涡模拟方法，模拟了攻角为8 °时Clark-Y 11. 7%翼型的空化湍流流动。在充分考虑流场非定常性的前提下，本文重点研究了如何提高空化条件下水翼性能的再现性。采用均质空化模型。大涡模拟的亚网格尺度模型是一方程动力学模型。数值模拟了再入射流伴随的空腔振荡和云腔脱落等非定常现象。大规模的展向涡也被捕获，这是间歇性地发生从发病的片腔。然后，板腔内部的流动被减速，流线绕过板腔。流线曲率在片腔后方形成分离泡，并伴有低压区。因此，片腔的长度是足够的和周围的压力分布和升力系数的水翼的再现性得到改善。
We conducted a large eddy simulation (LES) of cavitating turbulent flow around a Clark-Y11.7% hydrofoil at an angle of attack of 8 deg. We focused on the improvement of the reproducibility of hydrofoil performance under cavitating conditions when considering the unsteadiness of the flow field sufficiently by LES. A homogeneous cavitation model was adopted. The subgrid-scale model for LES was the one-equation dynamic model. The unsteady phenomena such as cavity oscillation and cloud cavity shedding accompanied by the reentrant jet were simulated. Large-scale spanwise vortices were also captured, which occurred intermittently from the onset of the sheet cavity. Then, the flow inside the sheet cavity was de-accelerated and the streamlines went around the sheet cavity. Streamline curvature formed a separation bubble behind the sheet cavity accompanied by a low-pressure region. Thus, the sheet cavity length was sufficient and the reproducibility of the pressure distribution around the hydrofoil and lift coefficient were improved.