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Large-eddy simulations of the flow over a semi-circular cylinder at Re = 50000
Computers & Fluids ( IF 2.8 ) Pub Date : 2021-06-26 , DOI: 10.1016/j.compfluid.2021.105054
Dmitry A. Lysenko , Mark Donskov , Ivar S. Ertesvåg

Large-eddy simulations (LES) of the flow over a semi-circular cylinder at a diameter-based Reynolds number 50000 and zero angle of attack are presented. In comparison with the prominent benchmark flows past circular and square cylinders, this test problem has been less investigated in the literature from both numerical and experimental perspectives. Also, this case can be even more challenging for validation and verification of the computational codes due to a negative lift force, which characterizes this flow regime. A standard numerical platform based on a second-order finite volume method and the k-equation eddy viscosity subgrid scale model and its dynamic version, implemented in the OpenFOAM CFD toolbox, is used for the present LES. A detailed spectral analysis is provided to examine dynamics of the vortex shedding and shear layer instabilities. The moderate Reynolds number is chosen in order to replicate experimental data, which is limited to integral flow parameters like the lift, drag and pressure coefficients and a Strouhal number. The numerical and experimental data available for the flows over the circular and square cylinders at the Reynolds number 2000050000 are used for qualitative assessment of the present results. Similarity of the turbulent wakes between the circular, square and semi-circular cylinders are discussed and compared both, for the integral flow parameters and high order statistics as well. Overall, present simulations provide reasonable agreement with available measurements and numerical calculations. Consistency and satisfactory agreement with the previous numerical and experimental results obtained for the circular and square cylinders are shown as well.



中文翻译:

Re = 50000 时半圆柱体上流动的大涡模拟

介绍了在基于直径的雷诺数 50000 和零攻角下半圆柱体上流动的大涡模拟 (LES)。与通过圆形和方形圆柱体的突出基准流相比,这个测试问题在文献中从数值和实验的角度研究较少。此外,由于负升力是这种流动状态的特征,因此这种情况对于计算代码的验证和验证可能更具挑战性。基于二阶有限体积法的标准数值平台和-方程涡粘度子网格比例模型及其动态版本,在 OpenFOAM CFD 工具箱中实现,用于当前的 LES。提供了详细的光谱分析来检查涡旋脱落和剪切层不稳定性的动力学。选择中等雷诺数是为了复制实验数据,该数据仅限于积分流动参数,如升力、阻力和压力系数以及 Strouhal 数。雷诺数下圆形和方形圆柱体上流动的可用数值和实验数据20000-50000用于对当前结果进行定性评估。讨论并比较了圆形、方形和半圆形圆柱之间湍流尾流的相似性,以及积分流动参数和高阶统计数据。总的来说,目前的模拟与可用的测量和数值计算提供了合理的一致性。还显示了与先前为圆形和方形圆柱体获得的数值和实验结果的一致性和令人满意的一致性。

更新日期:2021-07-08
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