Predictability problem for two-dimensional decaying turbulence is addressed by means of numerical simulations. Qualitative and quantitative comparisons with previous results obtained by closure approximations are critically examined. It is found that, as for other features of two-dimensional turbulence, the role of coherent vortices is essential for a correct interpretation of the results. A Lagrangian, vortex-based, definition for the growth of incertitudes leads in general to an enhancement of the predictability time.
Predictability in two-dimensional decaying turbulence / G., Boffetta; A., Celani; Crisanti, Andrea; Vulpiani, Angelo. - In: PHYSICS OF FLUIDS. - ISSN 1070-6631. - STAMPA. - 9:(1997), pp. 724-734. [10.1063/1.869227]
Predictability in two-dimensional decaying turbulence
CRISANTI, Andrea;VULPIANI, Angelo
1997
Abstract
Predictability problem for two-dimensional decaying turbulence is addressed by means of numerical simulations. Qualitative and quantitative comparisons with previous results obtained by closure approximations are critically examined. It is found that, as for other features of two-dimensional turbulence, the role of coherent vortices is essential for a correct interpretation of the results. A Lagrangian, vortex-based, definition for the growth of incertitudes leads in general to an enhancement of the predictability time.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
