Comparison of near-wall treatment methods for high Reynolds number backward-facing step flow
Comparison of near-wall treatment methods for high Reynolds number backward-facing step flow
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DOI：
10.1080/10618560500502519
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发表时间：
2005-10
影响因子：
1.3
通讯作者：
J. Kim;A. Ghajar;Clement C. Tang;G. Foutch
中科院分区：
文献类型：
--
作者：
J. Kim;A. Ghajar;Clement C. Tang;G. Foutch
本文比较了后向台阶绕流中采用不同湍流模型的近壁处理方法。根据台阶高度和平均流速，考虑雷诺数（Re）约为38，000（U ∞ = 44.2 m/s）。适当的近壁处理方法是选择湍流模型预测附壁流动的关键。通过应用标准壁面函数、非平衡壁面函数和具有六种不同湍流模型的两层模型进行预测。将这些结果与Driver和Seegmiller的数据进行比较（“Backward-facing step with inclined opposite wall-experiments by driver and seegmiller”，1985 a，http://cfd.me.umist.ac.uk/ercoftac [2003，Jan 31]）。非平衡壁函数与修正的k − ε模型预测最近的再附着长度。然而，双层模型给出的结果更能代表整个流型。计算结果表明，湍流模型和近壁处理方法的合理组合可以得到可靠的结果。
A comparison of near-wall treatment methods using different turbulence models for flow over a backward-facing step is presented. A Reynolds number (Re) of about 38,000 (U ∞ = 44.2 m/s), based on the step height and the mean stream velocity, was considered. An appropriate near-wall treatment method is critical to the choice of turbulence model used to predict wall-bounded flow. Predictions were obtained by applying standard wall functions, non-equilibrium wall functions and a two-layer model with six different turbulence models. These results were compared with data by Driver and Seegmiller (“Backward-facing step with inclined opposite wall—experiments by driver and seegmiller”, 1985a, http://cfd.me.umist.ac.uk/ercoftac [2003, Jan 31]). Non-equilibrium wall functions with modified k − ϵ models predicted the closest reattachment length. However, the two-layer model gave results more representative of the entire flow pattern. The predictions show that a proper combination of turbulence models and near-wall treatment methods give reliable results.