Abstract Simulating the flow around a propeller using large-eddy simulation (LES) with the immersed boundary (IB) method is challenging and computationally expensive. In this work, we carry out the grid-dependence study of LES with IB for simulating a propeller in crashback mode using four sets of gradually refined grids. The simulation results show that the grid-resolution requirements for accurately predicting different flow quantities are different. Specifically, it is found that the side-force coefficient and the averaged streamwise velocity are less sensitive to grid resolutions as compared with the thrust force coefficient and the turbulence kinetic energy, respectively. Furthermore, it is found that the computed results in the near wake region and the region around the blade are more sensitive to grid resolutions as compared with the far wake region, where the predictions from the four different grids are similar to each other. This suggests that a coarse grid simulation is adequate if only the far wake region is of interest, while a fine grid simulation is required if one cares about the flow around the blade and the flow in the near wake region.

中文翻译：

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使用浸入边界法的大涡模拟来模拟螺旋桨回弹的网格相关性研究

摘要 使用大涡模拟 (LES) 和浸入边界 (IB) 方法模拟螺旋桨周围的流动具有挑战性且计算成本高。在这项工作中，我们使用四组逐渐细化的网格对 LES 与 IB 的网格相关性进行了研究，以模拟碰撞模式下的螺旋桨。仿真结果表明，准确预测不同流量的网格分辨率要求是不同的。具体而言，与推力系数和湍流动能相比，侧向力系数和平均流向速度对网格分辨率的敏感性较低。此外，发现近尾流区域和叶片周围区域的计算结果与远尾流区域相比对网格分辨率更敏感，其中来自四个不同网格的预测彼此相似。这表明，如果仅关注远尾流区域，粗网格模拟就足够了，而如果关心叶片周围的流动和近尾流区域的流动，则需要精细网格模拟。