For over two decades, the quest for decentralized electric power generation has stimulated much research interest into the Savonius (or S-type) wind turbine rotors. To enhance their efficiency, the operating parameters have already been examined by various numerical and experimental techniques. While most researchers have focused on using selected turbulence models to arrive at some meaningful conclusions and recommendations, no study analyzing a range of turbulence models in a systematic and comprehensive manner is reported. This study thus aims at conducting 2-D unsteady numerical simulations of a conventional semicircular-bladed Savonius rotor using six different turbulence models, viz., standard k–ε, realizable k–ε, RNG k–ε models, standard k–ω and shear stress transport (SST) k–ω, and transition SST (TSST) turbulence models. The simulations are performed by commercial finite-volume method solver ANSYS Fluent 17.1 at a fixed Reynolds number (Re) of 1.23 × 10⁵ based on the rotor overall diameter. This study demonstrates the prediction capabilities of realizable k–ε, RNG k–ε, SST k–ω, and TSST models more accurately than those of other models. However, due to higher computational cost associated with TSST model, the use of realizable k–ε, RNG k–ε, and SST k–ω models for predicting the aerodynamic performance of other developed and to-be-developed profiles of Savonius rotor is recommended.

中文翻译：

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为了寻找合适的湍流模型来分析常规萨沃纽斯（S型）转子的空气动力学

在过去的二十多年中，对分散发电的追求激发了Savonius（或S型）风力涡轮机转子的大量研究兴趣。为了提高其效率，已经通过各种数值和实验技术检查了运行参数。尽管大多数研究人员专注于使用选定的湍流模型得出一些有意义的结论和建议，但尚无关于以系统，全面的方式分析一系列湍流模型的研究的报道。因此，本研究旨在使用六个不同的湍流模型，即标准k-ε，可实现的k-ε，可实现的k-ε，RNGk -ε模型，标准，对传统的半圆叶片Savonius转子进行二维非稳态数值模拟。k–ω和剪切应力传输（SST）k–ω，以及过渡SST（TSST）湍流模型。仿真是通过商业有限体积方法求解器ANSYS Fluent 17.1在基于转子总直径的固定雷诺数（Re）为1.23×10 ⁵的条件下进行的。这项研究证明了可实现的k–ε，RNG k–ε，SST k–ω和TSST模型的预测能力比其他模型更准确。但是，由于与TSST模型相关的较高计算成本，因此使用可实现的k–ε，RNG k–ε和SST k–ω 建议使用模型来预测Savonius转子的其他已开发和将要开发的轮廓的空气动力性能。