Linear global stability of a confined plume

被引：0
|
作者：
Lutz Lesshafft [1 ]
机构：
[1] Laboratoire d’Hydrodynamique,CNRS-Ecole polytechnique
来源：
Theoretical & Applied Mechanics Letters | 2015年 / 5 卷 / 03期
关键词：
Plume; Linear instability; Laminar flow stability; Buoyancy-driven instability; Bifurcation and symmetry breaking;
D O I：
暂无
中图分类号：
O175 [微分方程、积分方程];
学科分类号：
070104 ;
摘要：
A linear stability analysis is performed for a plume flow inside a cylinder of aspect ratio 1.The configuration is identical to that used by Lopez and Marques(2013) for their direct numerical simulation study.It is found that the first bifurcation,which leads to a periodic axisymmetric flow state,is accurately predicted by linear analysis:both the critical Rayleigh number and the global frequency are consistent with the reported DNS results.It is further shown that pressure feedback drives the global mode,rather than absolute instability.
引用
收藏
页码：126 / 128
页数：3
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