High‐order detached eddy simulation, zonal LES and URANS of cavity and labyrinth seal flows
High‐order detached eddy simulation, zonal LES and URANS of cavity and labyrinth seal flows
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高阶分离涡模拟、空腔和迷宫密封流动的区域 LES 和 URANS
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
P. Tucker
中科院分区：
文献类型：
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作者：
R. Jefferson;V. Nagabhushana Rao;J. Tyacke;P. Tucker
对混合数值大涡模拟(NLES)、分离涡模拟(DES)和URANS方法在一个空腔和一个迷宫密封几何形状上进行了评估。采用了高六阶离散格式，并用二维涡的算例进行了验证。混合方法采用了一种新的混合函数。对于URANS模拟，空腔内的流动保持稳定，结果显示不同模型之间存在显著差异。令人惊讶的是，在DES模拟中，在空腔中观察到了低水平的可分辨湍流，并且空腔剪切层仍然是二维的。混合RAN-NLES方法不受这一特点的影响。
Hybrid numerical large eddy simulation (NLES), detached eddy simulation (DES) and URANS methods are assessed on a cavity and a labyrinth seal geometry. A high sixth‐order discretization scheme is used and is validated using the test case of a two‐dimensional vortex. The hybrid approach adopts a new blending function. For the URANS simulations, the flow within the cavity remains steady, and the results show significant variation between models. Surprisingly, low levels of resolved turbulence are observed in the cavity for the DES simulation, and the cavity shear layer remains two dimensional. The hybrid RANS–NLES approach does not suffer from this trait.