Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2024 - September 11, 2024
It was known that in the process of breakup of a vortex structure, the transition to turbulent spots rapidly progresses triggered by the generation of vortices in the width direction. However, since multiple hairpin vortices exist even just before the breakup, it is not possible to confirm whether the vortices generated in the width direction are the direct cause of the breakup. In addition, it is interesting to observe whether reconnection occurs of vortices when multiple hairpin vortices are in the vicinity. Therefore, to simplify this phenomenon, we artificially generated two hairpin vortices close to each other in the laminar boundary layer and investigated behaviors that occur between these vortices pair. From the results obtained, it was found that even a hairpin vortex that should disappear on its own develops into a turbulent spot when two hairpin vortices are in close proximity and proceed downstream. Furthermore, it was confirmed that the heads of the two hairpin vortices merge when they were close together within twice the width of the hairpin vortex.
