Commoent on 'counter-rotting structures over a delta wing'

摘要

Recently, Hubner and komerath reported on the periodic nature of velocity fluctuations and streakline patterns near the suction surface of a delta wing. Although they speculate that these fluctuations re related to counter-rotating structures between the surface and the vortex core, there is no clear evidence of that in their paper. Instead, they do not seem to realize that these periodic fluctu- ations are due to a well-known phenomenon, vortex breakdown.