Artigo
Vorticity statistics and the time scales of turbulent strain
Registro en:
1539-3755
10.1103/PhysRevE.88.013005
Autor
Moriconi, Luca
Pereira, Rodrigo Miranda
Institución
Resumen
Time scales of turbulent strain activity, denoted as the strain persistence times of first and second order, are obtained from time-dependent expectation values and correlation functions of Lagrangian rate-of-strain eigenvalues taken in particularly defined statistical ensembles. Taking into account direct numerical simulation data, our approach relies on heuristic closure hypotheses which allow us to establish a connection between the statistics of vorticity and strain. It turns out that softly divergent prefactors correct the usual “1/s” strain time-scale estimate of standard turbulence phenomenology, in a way which is consistent with the phenomenon of vorticity intermittency. Indisponível.