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利用FLUENT软件模拟了自由流场中二维圆柱在不同雷诺数条件下所产生的阻力系数。当雷诺数小于100时,采用层流模型进行模拟;当雷诺数介于200和100 000之间时,利用剪应力传递SSTk-ω模型来研究流速场随时间的变化。经比较k-ε模型和SSTk-ω模型的计算结果表明:阻力系数计算值和实验值吻合良好,当雷诺数大于100时,SSTk-ε模型可以比k-ε模型更好地预测阻力系数;但当雷诺数超过5 000时,k-ε模型不再适用。
Using FLUENT software to simulate the free flow field of two-dimensional cylinder at different Reynolds number under the conditions of the resistance coefficient. When the Reynolds number is less than 100, the laminar flow model is used for simulation. When the Reynolds number is between 200 and 100 000, the SSTk-ω model is used to study the variation of velocity field with time. The calculated results of the k-ε model and the SSTk-ω model show that the calculated values of the drag coefficient are in good agreement with the experimental values. The SSTk-ε model can better predict the drag coefficient than the k-ε model when the Reynolds number is greater than 100. However, when the Reynolds number exceeds 5 000, the k-ε model is no longer applicable.