水利水电科技进展2017，Vol.37Issue(1)：17-21,5.DOI:10.3880/j.issn.1006-7647.2017.01.003
线性剪切来流对方柱绕流特性影响的数值分析
Numerical analysis of influences of linear shear flow on characteristics of flow past a square cylinder
摘要
Abstract
In order to investigate the effects of linear shear flow on characteristics of flow past a square cylinder, a numerical model for shear flow past a square cylinder was established by introducing the convective outflow boundary condition into the characteristic-based operator-splitting finite element method. The reliability of the numerical model was verified through simulation of the uniform flow past a square cylinder. The numerical results show that the shear parameter k has a significant effect on the two rows of vortices in the wake of flow past the square cylinder, and a larger k value inhibits the vortex shedding from the cylinder. When k≥0. 4, the formation region of vortices behind the cylinder becomes a triangular zone. As the value of k increases, the stagnation point shifts towards the lateral separation point. When k≥0. 3, the location of the stagnation point remains unchanged. The significant change in the mean drag coefficient occurs in the range 0. 2 ≤k≤0. 25. When k≥0. 2, the mean lift coefficient is negative.关键词
线性剪切来流/方柱绕流/特征线算子分裂有限元法/剪切参数/流场结构Key words
linear shear flow/flow past a square cylinder/characteristic-based operator-splitting finite element method/shear parameter/flow field structure分类
数理科学引用本文复制引用
王伟,水庆象,王大国,胡彬..线性剪切来流对方柱绕流特性影响的数值分析[J].水利水电科技进展,2017,37(1):17-21,5.基金项目
国家自然科学基金(41372301,51349011) （41372301,51349011）
西南科技大学研究生创新基金(15ycx037) （15ycx037）
