A new way to describe the transition characteristics of a rotating-disk boundary-layer flow

被引：27
|
作者：
Imayama, Shintaro [1 ]
Alfredsson, P. Henrik [1 ]
Lingwood, R. J. [1 ,2 ]
机构：
[1] KTH Mech, Linne FLOW Ctr, SE-10044 Stockholm, Sweden
[2] Univ Cambridge, Cambridge CB23 8AQ, England
来源：
PHYSICS OF FLUIDS | 2012年 / 24卷 / 03期
基金：
瑞典研究理事会;
关键词：
ABSOLUTE INSTABILITY; TURBULENCE;
D O I：
10.1063/1.3696020
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
A new method of graphically representing the transition stages of a rotating-disk flow is presented. The probability density function contour map of the fluctuating azimuthal disturbance velocity is used to show the characteristics of the boundary-layer flow over the rotating disk as a function of Reynolds numbers. Compared with the variation of the disturbance amplitude (rms) or spectral distribution, this map more clearly shows the changing flow characteristics through the laminar, transitional, and turbulent regions. This method may also be useful to characterize the different stages in the transition process not only for the rotating-disk flow but also for other flows. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3696020]
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