较大雷诺数下方柱绕流的数值模拟  

Numerical Simulation of the Flow Around a Square Cylinder at Higher Reynolds Numbers

作　　者：肖姚 秦浩[1,2] 宋文武[1,2] 胡帅[1] 

机构地区：[1]西华大学能源与动力工程学院,成都610039 [2]西华大学流体及动力机械教育部重点实验室,成都610039

出　　处：《动力工程学报》2017年第8期679-684,共6页Journal of Chinese Society of Power Engineering

基　　金：流体及动力机械教育部重点实验室开放基金资助项目(szjj2016-003);西华大学自然科学重点基金资助项目(Z1510418);国家自然科学基金资助项目(51408505)

摘　　要：基于k-ω SST模型和γ-Re_θ转捩模型,分析了雷诺数为1.4×10~4和2.2×10~4时二维方柱的流场特征,计算方柱的阻力系数和斯特劳哈尔数Sr,并对方柱平均流场的速度剖面进行分析,综合考虑不同湍流模型的计算成本及计算精度.结果表明:γ-Re_θ转捩模型比k-ω SST模型计算结果更加精确且所需计算成本较小;γ-Re_θ转捩模型能较好地预测方柱尾缘近壁回流区的位置和大小,且能较好地观测流场在方柱尾缘的再附着现象;在求解实际大雷诺数工程问题中γ-Re_θ转捩模型为优秀的湍流模型.Based on the k-ω SST model and y-Reo transition model, a study was conducted on the flow characteristics around a square cylinder respectively at the Reynolds number of 1.4 × 10^4 and 2.2× 10^4 , so as to calculate the drag coefficient and Strouhal number of the square cylinder, analyze its average velocity profiles, and finally to find out the calculation cost and precision of different turbulent models. Results show that compared with k-ω SST model, the γ-Reo transition model is more superior in calculation precision and cost, which is more effective in predicting the position and magnitude of the recirculation region behind the square cylinder, and in analyzing the reattachment of separated flows on side walls near the rear corner, and therefore is a practical model for engineering applications at high Reynolds numbers.

关 键 词：方柱绕流 数值模拟 阻力系数 湍流模型 时间步长 

分 类 号：O357[理学—流体力学]