Thermal Vortex Ring: Vortex-Dynamics Analysis of a High--Resolution Simulation - Météo-France Accéder directement au contenu
Pré-Publication, Document De Travail (Preprint/Prepublication) Année : 2024

Thermal Vortex Ring: Vortex-Dynamics Analysis of a High--Resolution Simulation

Résumé

Ahigh–resolution simulation of a thermal vortex ring is analyzed from the point of view of the vortex dynamics. A power–spectrum analysis of vortex ring sections suggests that the simulated f lows are overall “two dimensional” in the large scale limit, being dominated by axisymmetric components, but with a substantial contribution from the non-axisymmetric component at small scales. Contribution of the non–axisymmetric components is negligible in budgets of volumeintegrals of the vorticity and potential vorticity as well as the impulse (moments of the vorticity weighted by s$^n$ with n = −1, 0, 1, where is the distance from the vertical axis of the vortex ring). A concise description of the dynamics is obtained as a function of geometrical factors together with these three integral variables. Analysis shows that the geometrical factors are fairly close to constant with time, and thus a redundant closed description of the system is obtained in the similarity regime after spin up of the vortex ring. This redundancy leads to a constraint on the geometrical factors, which is reasonably satisfied by the simulation. A closed description is also obtained over the initial spin–up period of the vortex ring by adding a phenomenologicallyderived prognostic equation for the source for the volume integral of the potential vorticity (with = −1). Analysis of the budget supports this description.
Fichier principal
Vignette du fichier
ms.pdf (4.51 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04571213 , version 1 (07-05-2024)

Identifiants

  • HAL Id : hal-04571213 , version 1

Citer

Jun–ichi Yano, Hugh Morrison. Thermal Vortex Ring: Vortex-Dynamics Analysis of a High--Resolution Simulation. 2024. ⟨hal-04571213⟩
0 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More