Abstract The flow over a bluff body is an important phenomena in many engineering applications such as aerodynamic performance, buildings, bridges, and pipelines in cross flow. In this sense, such complex flow dynamics has become a huge challenge for both experimentalists and computational fluid dynamicists. With this in mind, widely-used URANS turbulence models, namely the standard k − ϵ , SST and RSM, are compared with an optimized k − ϵ . This optimized version of the standard k − ϵ model is based on the calibration of the k − ϵ parameters (e.g., Cμ, Cϵ2 and Cϵ1) from a strongly vortical flow. This tunned version was used in 3D jet-in-crossflow simulations and predicted far more accurate results than the standard turbulence models. However, to the authors’ knowledge, a systematic comparison of this calibrated model applied to the prediction of flows around bluff bodies has not yet been conducted. In order to verify the fidelity of the optimized model, we compare the numerical results with wind-tunnel experimental data. In general, the optimized k − ϵ turbulence model was surprisingly predictive for bluff bodies when compared to the other turbulence models.

中文翻译：

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优化的 k−ϵ 湍流模型在非流线体周围流动的性能

摘要 钝体上的流动是空气动力性能、建筑、桥梁、管道等工程应用中的一个重要现象。从这个意义上说，这种复杂的流动动力学对实验者和计算流体动力学家来说都是一个巨大的挑战。考虑到这一点，将广泛使用的 URANS 湍流模型，即标准 k − ϵ 、SST 和 RSM 与优化的 k − ϵ 进行比较。这个标准 k − ϵ 模型的优化版本基于对来自强涡流的 k − ϵ 参数（例如，Cμ、Cϵ2 和 Cϵ1）的校准。这个经过调整的版本用于 3D 射流交叉流模拟，并预测出比标准湍流模型更准确的结果。然而，据作者所知，尚未对用于预测钝体周围流动的这种校准模型进行系统比较。为了验证优化模型的保真度，我们将数值结果与风洞实验数据进行了比较。一般来说，与其他湍流模型相比，优化的 k − ϵ 湍流模型对钝体具有惊人的预测能力。