Coarse-grained description of a passive scalar
| dc.creator | Celani, Antonio | |
| dc.creator | Afonso, Marco Martins | |
| dc.creator | Mazzino, Andrea | |
| dc.date | 2006-02-27 | |
| dc.date.accessioned | 2026-07-07T07:53:21Z | |
| dc.date.available | 2026-07-07T07:53:21Z | |
| dc.description | The issue of the parameterization of small-scale dynamics is addressed in the context of passive-scalar turbulence. The basic idea of our strategy is to identify dynamical equations for the coarse-grained scalar dynamics starting from closed equations for two-point statistical indicators. With the aim of performing a fully-analytical study, the Kraichnan advection model is considered. The white-in-time character of the latter model indeed leads to closed equations for the equal-time scalar correlation functions. The classical closure problem however still arises if a standard filtering procedure is applied to those equations in the spirit of the large-eddy-simulation strategy. We show both how to perform exact closures and how to identify the corresponding coarse-grained scalar evolution. | |
| dc.description | 22 pages; submitted to Journal of Turbulence | |
| dc.identifier | https://arxiv.org/abs/nlin/0602061 | |
| dc.identifier | http://arxiv.org/abs/nlin/0602061 | |
| dc.identifier | Journal of Turbulence, vol. 7, no. 52, pp. 1-18 (2006) | |
| dc.identifier | doi:10.1080/14685240600779388 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/126221 | |
| dc.subject | Chaotic Dynamics | |
| dc.title | Coarse-grained description of a passive scalar | |
| dc.type | text |