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Applied Mathematics and Mechanics (English Edition) ›› 1995, Vol. 16 ›› Issue (4): 383-389.

• 论文 • 上一篇    下一篇

SECONDARY INSTABILITY OF LARGE SCALE STRUCTURE IN FREE TURBULENT SHEAR LAYER

赵耕夫   

  1. Tianjin University, Tianjin 300072, P. R. China
  • 收稿日期:1994-06-03 出版日期:1995-04-18 发布日期:1995-04-18
  • 基金资助:

    Project supported by the National Natural Science Foundation of China

SECONDARY INSTABILITY OF LARGE SCALE STRUCTURE IN FREE TURBULENT SHEAR LAYER

Zhao Geng-fu   

  1. Tianjin University, Tianjin 300072, P. R. China
  • Received:1994-06-03 Online:1995-04-18 Published:1995-04-18
  • Supported by:

    Project supported by the National Natural Science Foundation of China

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摘要： The secondary instability theory is used to study the behavior of spatially growingdisturbance in free turbulent shear layer.The numerical results indicate that secondaryinstability of subharmonic mode shows a strong choice of spanwise wavenumber andthe maximum growth two dimensional case.In contrast to that secondary instabilities of the fundamental mode occur in a wide scope of spanwise wavenumber.We have found so called translative at β=0 and bifurcation phenomenon for an amplitude of the KH wave larger than 0.06.Dey words instability,large scale structure,bifurcation

Abstract: The secondary instability theory is used to study the behavior of spatially growingdisturbance in free turbulent shear layer.The numerical results indicate that secondaryinstability of subharmonic mode shows a strong choice of spanwise wavenumber andthe maximum growth two dimensional case.In contrast to that secondary instabilities of the fundamental mode occur in a wide scope of spanwise wavenumber.We have found so called translative at β=0 and bifurcation phenomenon for an amplitude of the KH wave larger than 0.06.Dey words instability,large scale structure,bifurcation

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