Improved delayed detached-eddy simulation of massive separation around triple cylinders
Improved delayed detached-eddy simulation of massive separation around triple cylinders
复制标题
改进的三重圆柱体周围大规模分离的延迟分离涡模拟
DOI：
10.1007/s10409-015-0445-2
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发表时间：
2015-02
影响因子：
3.5
通讯作者：
Luo Kunyu
中科院分区：
文献类型：
--
作者：
Xiao Zhixiang;Luo Kunyu
摘要采用基于剪应力输运(SST)模型的改进的延迟分离涡模拟(IDDES)方法，结合高阶自适应耗散格式，对串列布置的三柱大分离绕流进行了数值模拟。相邻圆柱体之间的间距是亚临界的(1.435D)。将IDDES的计算结果与实验数据进行了比较，结果表明，除了缝隙区域的不对称性外，数值计算结果与已有的测量结果吻合较好。用同样的方法研究了流过TIC的流动。一般情况下，通过TERE的平均流量，如速度、压力和涡度，与TC的相应分量相似。然而，表面上的压力波动一致地大于TC表面上的压力波动。同时，通过TRIC的瞬时流动要复杂得多。为了研究流动相互作用和气动声学问题，提出了一种简化的起落架结构形式，即串联圆柱体布置，这涉及到复杂的流动现象和相互作用。改进的延迟分离涡模拟(IDDES)显示了RANS/LES混合方法在大规模分离和高度非定常湍流的精确数值预报中的巨大潜力，提供了直观详细的流动结构，定量地洞察了非定常流动现象的机理，并为噪声预报提供了精确的声源。
AbstractThe massively separated flow past triple cylinders (TriC) in tandem arrangement is simulated using the improved delayed detached-eddy simulation (IDDES) method based on the shear stress transport (SST) model, coupled with the high order adaptive dissipation scheme. The spacing between adjacent cylinders is sub-critical (1.435D). IDDES prediction of two cylinders (TC) with the same spacing is compared to experimental data for validation, and the numerical results agree well with the available measurements, except for the asymmetry in the gap region. The flow past TriC is investigated using the same method. Generally, the mean flow quantities past TriC, such as the velocity, pressure, and vorticity, are similar to the corresponding components of TC. However, the pressure fluctuations on the TriC surface are uniformly larger than those on TC. Meanwhile, the instantaneous flows past TriC are much more complex. The periodical blockage in the first gap region is found in the TriC case and leads to the up-and-down movement of shear layer in the second gap region.Graphical AbstractThe tandem cylinders arrangement is proposed as the simplified landing gear geometry for the study of flow interaction and aeroacoustics, which involves complicated flow phenomena and interactions. The improved delayed detached-eddy simulation (IDDES) has shown the considerable promise of hybrid RANS/LES methods in accurate numerical prediction of the massively separated and highly unsteady turbulent flow, providing visually detailed flow structures, quantitative insight into the mechanism of unsteady flow phenomena, and precise sound sources for noise prediction.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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DOI：
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DOI：
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发表时间：
2006-06
期刊：
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DOI：
10.2514/6.2012-3033
发表时间：
2012-06
期刊：
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影响因子：
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作者：
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通讯作者：
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