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A linear secondary instability mechanism is presented that leads to the occurrence of subharmonic three-dimensional disturbances in wall-bounded shear flows. The instability originates from the periodic redistribution of vorticity in the shear flow by small but finite-amplitude Tollmien–Schlichting waves. Low threshold amplitudes and other characteristics of this instability are consistent with experiments and may elucidate various obscure observations.
Thorwald Herbert (Fri,) studied this question.
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