摘要
本文基于CFD软件分析了二维圆管流道内的圆柱绕流问题。通过选取k-w和k-ε湍流模型,分析了两种湍流模型在计算圆柱绕流时的差异。结果显示在k-w能够更为准确地捕捉到涡脱落过程,St数与理论值相差不超过1%;而k-ε模型误差较大,达到10%以上。对比了定常和非定常k-w模型的区别,发现定常计算时无法捕捉到涡脱落的过程,流场趋于稳态,计算快速收敛。对比了不同雷诺数下k-ε和k-w模型对涡脱落的捕捉能力,k-w模型在低雷诺数时能够成功捕捉涡脱落过程,而k-ε模型则相反。
Based on Fluent software, the flow around a cylinder in a two-dimensional circular tube flow path is analyzed. Through the selection and turbulence model, the difference between the two turbulence models in calculating the flow arou U8CDce between the number and the theoretical value is not more than 1%;and the model error is large, reaching more than 10%. Comparing the difference between steady and unsteady models, it is found that the process of vortex shedding cannot be captured during steady calculation, the flow field tends to a steady state, and the calculation converges quickly. Comparing the ability of the model to capture vortex shedding under different Reynolds numbers, the model can successfully capture the vortex shedding process at low Reynolds numbers, while the model does the opposite.
作者
王亚龙
朱潇潇
WANG Ya-Long;ZHU Xiao-Xiao(University of Aerospace Engineeing,Beijing101416,China)
出处
《机电产品开发与创新》
2022年第2期13-16,共4页
Development & Innovation of Machinery & Electrical Products
关键词
圆柱绕流
涡脱落
湍流模型
St数
Flow around a cylinder
Vo’rtex shedding
Turbulence model
Stnumber
