A comparative study of turbulence models in a transient channel flow
A comparative study of turbulence models in a transient channel flow
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DOI：
10.1016/j.compfluid.2013.10.037
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发表时间：
2014-01
影响因子：
2.8
通讯作者：
S. Gorji;M. Seddighi;C. Ariyaratne;A. Vardy;T. O'Donoghue;D. Pokrajac;S. He
中科院分区：
文献类型：
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作者：
S. Gorji;M. Seddighi;C. Ariyaratne;A. Vardy;T. O'Donoghue;D. Pokrajac;S. He
一些低雷诺数湍流模型的性能进行评估，对直接数值模拟（DNS）。所有的模型都适用于一个非定常流，包括一个斜坡式漂移的流量内的封闭通道。从初始雷诺数9308（基于水力直径和体积速度）到最终雷诺数29，650，流速随时间线性增加。加速度变化以覆盖低、中和高加速度。结果表明，在所研究的模型中，Launder和Sharma（1974）和Chang等人（1995）[28]的k-ε模型以及Langtry和Menter（2009）[38]的γ-Reθ转变模型很好地捕捉了这些非定常湍流的关键流动特征。对于低和中等加速率的情况下，这三个模型产生的壁面剪应力的预测，以及与相应的DNS数据。对于高加速度的情况，Langtry和Menter（2009）[38]的γ-Reθ模型和Launder和Sharma（1974）的k-ε模型可以合理预测壁面剪应力。
The performance of a number of low-Reynolds number turbulence models is evaluated against direct numerical simulations (DNS). All models are applied to an unsteady flow comprising a ramp-type excursion of flow rate inside a closed channel. The flow rate is increased linearly with time from an initial Reynolds number of 9308 (based on hydraulic diameter and bulk velocity) to a final Reynolds number of 29,650. The acceleration rate is varied to cover low, intermediate and high accelerations. It is shown that among the models investigated, thek–εmodels of Launder and Sharma (1974) and Chang et al. (1995) [28] and theγ–Reθtransition model of Langtry and Menter (2009) [38] capture well the key flow features of these unsteady turbulent flows. For the cases of low and intermediate acceleration rates, these three models yield predictions of wall shear stress that agree well with the corresponding DNS data. For the case of high acceleration, theγ–Reθmodel of Langtry and Menter (2009) [38] and thek–εmodel of Launder and Sharma (1974) yield reasonable predictions of wall shear stress.