Large–eddy simulations in mixed–flow pumps using an immersed boundary method
Large–eddy simulations in mixed–flow pumps using an immersed boundary method
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DOI：
10.1016/j.compfluid.2011.02.004
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发表时间：
2011-08
影响因子：
2.8
通讯作者：
A. Posa;A. Lippolis;R. Verzicco;E. Balaras
中科院分区：
文献类型：
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作者：
A. Posa;A. Lippolis;R. Verzicco;E. Balaras
旋转机械应用中的湍流和过渡流的计算是非常具有挑战性的，因为它的几何形状通常由多个旋转和静止部分组成。应用成熟的贴体方法经常使用重叠网格和不同的参照系，这对该方法的总体精度和成本效益有不利影响。在目前的工作中，我们探讨了使用单一参考系和浸没边界方法进行此类流动计算的可行性。特别是，我们报道了这类流动中的第一个大涡模拟，其中具有最佳守恒性质的结构化柱坐标求解器与浸没边界方法相结合被使用。为了评估计算的准确性，将计算结果与文献[1]中的实验测量结果进行了比较。给出了使用标准Smagorinsky模型和过滤结构函数模型的结果。结果表明，该方法适用于所考虑的流动，而采用更先进的亚格子尺度模型得到的结果与实验结果吻合较好。我们还简要讨论了瞬时流动动力学的一些特征，以提供从这种计算中可以提取的丰富信息的一瞥。
Computations of turbulent and transitional flows in rotating machinery applications are very challenging due to complexity of the geometry, which usually consists of multiple rotating and stationary parts. The application of well-established, body-fitted methods frequently utilizes overset grids and different reference frames, which have an adverse impact on the overall accuracy and cost-efficiency of the method. In the present work we explore the feasibility of performing computations of such flows using a single reference frame and an immersed-boundary approach. In particular, we report one of the first large-eddy simulation in this class of flows, where a structured cylindrical coordinate solver with optimal conservation properties is utilized in conjunction with an immersed-boundary method. To evaluate the accuracy of the computations the results are compared to the experimental measurements in [1]. Results using the standard Smagorinsky model and the Filtered Structured Function model are presented. We demonstrate that the overall approach is well suited for the flow under consideration and the results with the more advanced subgrid scale model are in good agreement with the experiment. We also briefly discuss some of the features of the instantaneous flow dynamics, to provide a glimpse of the wealth of information that can be extracted from such computations.