Coherent structures in countercurrent axisymmetric shear flows

2003 ◽  
Vol 19 (1) ◽  
pp. 11-32 ◽  
Author(s):  
Xie Xilin ◽  
Ma Weiwei ◽  
Zhou Huiliang
Keyword(s):  
Coherent Structures ◽  
Shear Flows ◽  
Axisymmetric Shear

scholarly journals Exact coherent structures in an asymptotically reduced description of parallel shear flows

2014 ◽  
Vol 47 (1) ◽  
pp. 015504 ◽  
Author(s):  
Cédric Beaume ◽  
Edgar Knobloch ◽  
Gregory P Chini ◽  
Keith Julien
Keyword(s):  
Coherent Structures ◽  
Shear Flows ◽  
Parallel Shear Flows

Self-sustained states at Kolmogorov microscale

2015 ◽  
Vol 781 ◽  
Author(s):  
Kengo Deguchi
Keyword(s):  
Coherent Structures ◽  
Small Amplitude ◽  
Shear Flows ◽  
Laminar Flows ◽  
Large Reynolds Number ◽  
Turbulent Transition ◽  
New States ◽  
Asymptotic Development ◽  
Kolmogorov Scale ◽  
Small Disturbances

It is shown theoretically how the scaling of coherent structures in shear flows changes their asymptotic development at large Reynolds number. Based on the theory a family of nonlinear self-sustained states at Kolmogorov microscale is numerically identified on the laminar–turbulent boundary of shear flows. Theoretically and numerically the states connect to known asymptotic states existing at larger scale. The asymptotically very small amplitude of the new states may explain why strongly sheared, linearly stable laminar flows can cause a turbulent transition by small disturbances. The numerically obtained Kolmogorov-scale solutions can be used to describe the theoretically minimal self-sustained structures appearing in various shear flows.

The low frequency sound from multipole sources in axisymmetric shear flows. Part 2

1976 ◽  
Vol 75 (1) ◽  
pp. 17-28 ◽  
Author(s):  
M. E. Goldstein
Keyword(s):  
Shear Flows ◽  
Acoustic Radiation ◽  
Previous Analysis ◽  
Low Frequency ◽  
Frequency Sound ◽  
Doppler Factor ◽  
Axisymmetric Shear ◽  
Multipole Sources

A previous analysis of the acoustic radiation from multipole sources is extended to include additional components of the dipole and quadrupole sources. It is found that, unlike the components of the sources considered in the previous paper, the exponent of the Doppler factor now depends on the location of the sources within the jet.

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