Numerical simulation of flow past a circular cylinder with different confinements
In this paper, a direct numerical solver using spectral-element method was adopted to carry out the numerical simulation of flow past a circular cylinder with three different confinements, i.e.plane channel (case 1), a plane wall (case 2) and a wall with fully developed scour profile (case 3).The Reynolds number is in the range of 100 to 300.The flow features including vortex shedding frequencies, vortex structures are presented.The onset of three-dimensionality was investigated via Floquet stability analysis.The influence of confinements were investigated by observing the vortex generated at the trailing edge of the cylinder.Vortices in case 1 are similar to unconfined case, but that in case 2 and case 3 showed an enormous asymmetry.Case 1 and case 2 have a similar critical point of onset for three-dimensionality, which has little difference to unconfined case.Case 3 behaves in another way, getting a much lower vortex shedding frequency and a lower critical Reynolds number for mode A.Critical points for mode B are nearly the same for all cases.
cylinder wake vortex shedding Floquet stability analysis
Xianquan Lv Dan Yang Yongliang Xiong
School of Architecture and Ocean Engineering, Huazhong University of Science and Technology Wuhan, C School of Civil Engineering and Mechanics, Huazhong University of Science and Technology Wuhan, Chin
国际会议
The Second Conference of Global Chinese Scholars on Hydrodynamics(第二届全球华人水动学学术会议)
江苏 无锡
英文
303-308
2016-11-11（万方平台首次上网日期，不代表论文的发表时间）