A series of CFD analysis were conducted for triangular array rod bundles with different pitch-to-diameter ratios (P/D=1.20, 1.05) to assess the prediction performance of the RANS models, i.e., the standard k-ε model and the second-order closure models. This paper presents the effect of the pitch-to-diameter ratio and the Reynolds number. The CFD results were compared with the DNS results and the available experimental data. The second-order model by Speziale-Sarkar-Gatski predicted the mean flow characteristics and the turbulent structure for P/D=1.20 at high Reynolds number fairly well. However, the RANS models showed a significant difference from the DNS for P/D=1.05 or at low Reynolds number.
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机译：对于具有不同间距到直径比的三角形阵列杆束（P / D = 1.20,1.05）进行了一系列CFD分析，以评估RAN模型的预测性能，即标准K-ε模型和第二个-Order封闭模型。本文呈现了间距到直径比和雷诺数的影响。将CFD结果与DNS结果和可用的实验数据进行比较。 Speziale-Sarkar-Gatski的二阶模型预测了平均流量特性和P / D = 1.20的湍流结构相当良好。然而，RAN模型与P / D = 1.05或低雷诺数的DNS显示出显着差异。
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