RT Journal Article
T1 Fourier signature of filamentary vorticity structures in two-dimensional turbulence
A1 Reynolds Barredo, José Miguel
A1 Newman, D.E.
A1 Terry, P. W.
A1 Sánchez Fernández, Luis Raúl
AB It is shown that coherent regions of isotropic two-dimensional (2D) turbulence can be clearly identified in the phase part of the Fourier spectrum. Certain spectral phase events are particularly prominent, and are much stronger in the range of wave numbers corresponding to the dissipation range. It is shown that these events are associated with spatially localized filamentary structures in the 2D vorticity field that historically have been related to the intermittency of dissipation. The identified phase signature provides a particularly transparent diagnostic of the temporal evolution of the coherent coupling of disparate scales in anisostropic intermittent dissipative events. These results open the possibility of using the phase of the Fourier transform as a new turbulence diagnostic that identifies and quantitatively characterizes details pertaining to dissipative events.
PB IOP Publishing
SN 0295-5075
YR 2016
FD 2016-08
LK https://hdl.handle.net/10016/35751
UL https://hdl.handle.net/10016/35751
LA eng
NO Research supported in part by the Spanish nationalprojects No. ENE2009-12213-C03-03, ENE2012-33219,UNC313-4E-2361 and ENE2012-31753 and the US DOEOffice of Science Grants No. DE-FG02-04ER54741 andDE-FG02-89ER53291. Simulations run at the Uranussupercomputer cluster at Universidad Carlos III deMadrid.
DS e-Archivo
RD 27 jul. 2024