Abstract:
:The essence of turbulent flow is the conveyance of energy through the formation, interaction, and destruction of eddies over a wide range of spatial scales-from the largest scales where energy is injected down to the smallest scales where it is dissipated through viscosity. Currently, there is no mechanistic framework that captures how the interactions of vortices drive this cascade. We show that iterations of the elliptical instability, arising from the interactions between counter-rotating vortices, lead to the emergence of turbulence. We demonstrate how the nonlinear development of the elliptical instability generates an ordered array of antiparallel secondary filaments. The secondary filaments mutually interact, leading to the formation of even smaller tertiary filaments. In experiments and simulations, we observe two and three iterations of this cascade, respectively. Our observations indicate that the elliptical instability could be one of the fundamental mechanisms by which the turbulent cascade develops.
journal_name
Sci Advjournal_title
Science advancesauthors
McKeown R,Ostilla-Mónico R,Pumir A,Brenner MP,Rubinstein SMdoi
10.1126/sciadv.aaz2717subject
Has Abstractpub_date
2020-02-28 00:00:00pages
eaaz2717issue
9issn
2375-2548pii
aaz2717journal_volume
6pub_type
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