[lakeat]

I'm quite confused?

I read many papers, I saw Jeong and Hussain said there are just quasi-streamwise vortex below y+=60, well, I cannot see hairpin in my simulation either, so may I ask you guys who are familiar with this field,

1. Does so-called hairpin exist?
2. Is bursting just a conceptional idea or is it real in physical world? The question is how can you be sure whether bursting is caused by low-speed streak instability or the broken of hiarpin head????

Thank you