Thank you John and Owain.
An interesting reference about creation of vortices is the 2016 Nobel Prize of Physic too, despite it matters about topological phase transition and quantic theory.
And don't forget Libchaber vortices .…
What a beautiful science, that theory on lift !
roulishollandais
"Scientific Background on the Nobel Prize in Physics 2016
TOPOLOGICAL PHASE TRANSITIONS AND TOPOLOGICAL PHASES OF MATTER
compiled by the Class for Physics of the Royal Swedish Academy of Sciences"