POD ANALYSIS OF THREE-DIMENSIONAL HARMONICALLY FORCEDWAKE FLOW OF A CIRCULAR CYLINDER

被引：2
|
作者：
Nabatian, Negar [1 ]
Xu, Xiaofei [1 ]
Mureithi, Njuki [1 ]
机构：
[1] Ecole Polytech, Dept Mech Engn, Montreal, PQ H3C 3A7, Canada
来源：
TRANSACTIONS OF THE CANADIAN SOCIETY FOR MECHANICAL ENGINEERING | 2015年 / 39卷 / 04期
关键词：
secondary transition; immersed-boundary method; temporal instability; PROPER ORTHOGONAL DECOMPOSITION; ORDER MODELS; VORTEX; TRANSITION; REDUCTION;
D O I：
10.1139/tcsme-2015-0063
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
A 3D numerical simulation of a circular cylinder wake is presented in this paper. The cylinder is harmonically forced in the stream-wise direction. The objective of the present work is to investigate the effect of the oscillation amplitude on the secondary transition of the wake. The frequency of the lift force is then linked to the form of the vortex shedding mode. The relation between these vortex shedding modes using POD analysis of the transverse velocity and the unsteady lift coefficient of 3D simulation is in good agreement with the 2D model. Results show that the 3D spanwise effect, which can change the wake structure, is suppressed at Re = 200 by streamwise oscillation of the cylinder. Thus the 2D analysis can effectively model the temporal instability of the wake flow.
引用
收藏
页码：789 / 803
页数：15
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