高Re数圆柱绕流二维数值模拟的适用性分析

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (7) : 98-101.

论文

高Re数圆柱绕流二维数值模拟的适用性分析

祝志文

作者信息 +

On feasibility of a two-dimensional RANS models in application to numerical prediction of circular cylinder aerodynamics

ZHU Zhi-wen

Author information +

文章历史 +

摘要

采用雷诺时均N-S方程(RANS)和SST 湍流模型，对外径0.12m的圆柱开展了二维数值模拟，计算的Re数范围为1.2×105 ~ 3.7×105。为保证计算结果的合理性，采用了一种新的计算域外形和网格分区，保证了在圆柱周围和尾迹的大范围内形成高质量的正交四边形单元。基于获得的不同网格尺度和时间步大小的圆柱气动力系数时程、平均值和均方根值，以及漩涡脱落的Strouhal (St)数，开展了网格尺度和时间步长无关性检查，确定了合理的数值模拟参数。然后计算了不同Re数下圆柱的阻力系数平均值和St数。通过与相关文献的研究结果对比，本文认为采用二维RANS模型难以合理预测圆柱的气动力和涡脱特性。

Abstract

Numerical simulations for fixed circular cylinders with diameter of 0.12m are performed in a two-dimensional (2D) domain with the Reynolds Averaged Navier-Stokes (RANS) equations and SST turbulent model. The Re number ranges from 1.2×105 to 3.7×105. In order to insure the simulation quality, a suitable computational domain is put forward with a high quality partitioning gird strategy. Based on the obtained aerodynamic coefficients time histories, mean and root-mean-square values, as well as Strouhal (St) number, grid and time step independency check are carried out as to identify suitable simulation parameters. Then, aerodynamic coefficients and St number of the cable at various Re numbers are predicted. After comparing the present results with available references, it is recommended that the 2D RANS simulation for fixed circular cylinders may not be capable of obtaining acceptable aerodynamics predictions.

导出引用

祝志文. 高Re数圆柱绕流二维数值模拟的适用性分析[J]. 振动与冲击, 2013, 32(7): 98-101

ZHU Zhi-wen. On feasibility of a two-dimensional RANS models in application to numerical prediction of circular cylinder aerodynamics[J]. Journal of Vibration and Shock, 2013, 32(7): 98-101