The secondary instability theory is used to study the behavior of spatially growing disturbance in free turbulem shear layer. The numerical results indicate that secondary instability of subharmonic mode shows a strong choice of spanwise wavenumber and the maximum growth rate occurs in 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 instability at β=0 and bifurcation phenomenon for an amplitude of the KH wave larger than 0.06.
secondary instability large scale structure bifurcation
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