Very Large Eddy Simulation for the Prediction of Unsteady Vortex Motion
Very Large Eddy Simulation for the Prediction of Unsteady Vortex Motion
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DOI：
10.1007/978-3-662-08797-8_16
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
A. Ruprecht;Thomas Helmrich;Iva Buntić
中科院分区：
文献类型：
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作者：
A. Ruprecht;Thomas Helmrich;Iva Buntić
本文在Chen和Kim的扩展k-ε模型的基础上，发展并提出了一种新的适用于超大涡模拟的湍流模型。通过引入自适应滤波技术，该模型可以区分流动的数值解部分和未解部分。将其应用于三叉管内不稳定涡运动的数值模拟。这种流动现象不能用经典的RANS方法和常用的湍流模型来预测。将VLES方法与新的湍流模型相结合，对这一现象进行了较好的预测，计算结果与测量数据吻合较好。
A new turbulence model for Very Large Eddy Simulation, based on the extended k-ε model of Chen and Kim is developed and presented in this paper. Introducing an adaptive filtering technique, the model can distinguish between numerically resolved and unresolved parts of flow. It is applied to the simulation of unstable vortex motion in a pipe trifurcation. This flow phenomenon cannot be predicted with classical RANS methods and commonly used turbulence models. Using the VLES method with the new turbulence model, the phenomenon is well predicted and the results agree reasonably well with measurement data.