Numerical prediction of vortex instabilities in turbomachinery
Numerical prediction of vortex instabilities in turbomachinery
复制标题
涡轮机械中涡不稳定性的数值预测
DOI：
10.1007/978-3-540-33844-4_17
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
A. Ruprecht
中科院分区：
文献类型：
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作者：
A. Ruprecht
非定常涡旋主导流场的预测是一项具有挑战性的任务，应用经典的RANS模拟往往失败且结果不佳。这里展示了一种VLES方法。对于这种方法，在Kim和Chen的k- ε模型的基础上提出了一种自适应湍流模型。将此方法应用于旋涡控制的流动中，如直扩管内的涡绳和船舶螺旋桨处的尖涡，可以提高计算精度。因此，这种方法似乎适合于这种类型的流。
5 ConclusionsThe prediction of unsteady vortex dominated flows show is a challenging task, applying classical RANS simulations often fails and leads to poor results. Here a VLES approach is shown. For this approach an adaptive turbulence model based on the k-ɛmodel of Kim and Chen is developed. Applying this approach to vortex dominated flows - vortex rope in a straight diffuser and tip vortex at a ship propeller - leads to an increase on computational accuracy. Therefore this approach seems to be suitable for this types of flows.