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首页> 外文期刊>Applied Mathematical Modelling >Comparison of turbulence models in simulating swirling pipe flows
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Comparison of turbulence models in simulating swirling pipe flows

机译：模拟旋流管流动中湍流模型的比较

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摘要

Swirling flow is a common phenomenon in engineering applications. A numerical study of the swirling flow inside a straight pipe was carried out in the present work with the aid of the commercial CFD code fluent. Two-dimensional simulations were performed, and two turbulence models were used, namely, the RNG k-ε model and the Reynolds stress model. Results at various swirl numbers were obtained and compared with available experimental data to determine if the numerical method is valid when modeling swirling flows. It has been shown that the RNG k-ε model is in better agreement with experimental velocity profiles for low swirl, while the Reynolds stress model becomes more appropriate as the swirl is increased. However, both turbulence models predict an unrealistic decay of the turbulence quantities for the flows considered here, indicating the inadequacy of such models in simulating developing pipe flows with swirl.
机译：旋流是工程应用中的常见现象。在目前的工作中，借助商用CFD代码流利软件对直管内的旋流进行了数值研究。进行了二维模拟，并使用了两个湍流模型，即RNGk-ε模型和雷诺应力模型。获得了各种旋流数的结果，并将其与可用的实验数据进行比较，以确定在对旋流进行建模时数值方法是否有效。结果表明，对于低旋流，RNGk-ε模型与实验速度曲线具有更好的一致性，而随着旋流的增加，雷诺应力模型变得更加合适。但是，这两种湍流模型都针对此处考虑的流预测了湍流量的不切实际衰减，这表明此类模型不足以模拟带有旋流的发育中的管道流。

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