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مکانیک::
زوج گرداب
The long and short of vortex pair instability [1996] 90
In the absence of a swirl (not shown), seven weak azimuthal deformations are identifiable, which develop further downstream into mature mushroom-like structures composed of counter-rotating streamwise vortex pairs: rotation enhances the concentration of braid vorticity into secondary streamwise structures.
Without swirl, the axial shear gener- ates vortex rings, whereas counter-rotating streamwise vortex pairs form in the braids connecting the rings due to a secondary instability.
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