水利水电科技进展2017，Vol.37Issue(2)：27-32,6.DOI:10.3880/j.issn.1006-7647.2017.02.005
特征线算子分裂有限元的圆柱绕流大涡模拟
Large eddy simulation of flow around circular cylinder combined with characteristic-based operator-splitting finite element method
摘要
Abstract
In order to investigate the characteristics of flow fields around circular cylinders, a numerical model was developed by combing large eddy simulation ( LES) with the characteristic-based operator-splitting finite element method. The model was used to simulate flow fields around a circular cylinder and two circular cylinders in tandem arrangement, and the obtained results agree with the existing results. The simulation results show that, for the flow around a circular cylinder, with the increase of the Reynolds number, the vortexes occurring at the top and bottom surfaces alternatively in the near-wake region gradually approach each other and pass along the horizontal line through the geometric center of the cylinder, and the location of vortex shedding gradually approach the cylinder;for the two circular cylinders in tandem arrangement, with Re=1000, the critical space between the two circular cylinders is 2. 25 to 2. 50 times their diameters;when the space between the two circular cylinders is smaller than the critical space, vortex shedding does not occur at the rear of the upstream cylinder, and the pressure in the space between the two circular cylinders is stable;when the space between the two circular cylinders is larger than the critical space, vortex shedding occurs, and strong negative pressure regions occur at the top and bottom surfaces alternatively in the near-wake region of the upstream cylinder.关键词
圆柱绕流/大涡模拟/特征线算子分裂有限元/临界间距Key words
flow around circular cylinder/large eddy simulation/characteristic-based operator-splitting finite element method/critical space分类
建筑与水利引用本文复制引用
胡彬,水庆象,王大国,彭仁涛..特征线算子分裂有限元的圆柱绕流大涡模拟[J].水利水电科技进展,2017,37(2):27-32,6.基金项目
四川省教育厅科研项目(16CZ0013) （16CZ0013）
绵阳市科技计划项目(14S-02-6) （14S-02-6）
西南科技大学研究生创新基金(14YCXJJ0039) （14YCXJJ0039）
