HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Theses

Dynamique des tourbillons pancake en milieu stratifie : diffusion et interaction ondes-tourbillons

Abstract : Stably stratified fluids give rise to distinct internal wave modes and potential vorticity modes (PV). The timescales relevant to these two types of motion separate when the stratification is strong: Internal waves propagate on a fast timescale based on the buoyancy frequency (TN = N-1) while a slower timescale in terms of the horizontal advection --TA = Lh/U, where Lh and U are the horizontal length scale and mean velocity of the horizontal motions-- characterizes the evolution of vortices. An illustration of the difference between these two modes can be observed in turbulent regions decaying in presence of background stable stratification : As vertical motions are suppressed, energy is either radiated as internal waves, which propagate away from the initially turbulent region, or transferred to horizontal advective motions which are finally organized as patches of potential vorticity. This thesis presents a theoretical and experimental study of the interaction between pancake vortices (representing the PV mode) and internal gravity waves in a strongly stratified fluid, and of the diffusive mechanisms of pancake vortices.
Complete list of metadata

https://pastel.archives-ouvertes.fr/tel-00007046
Contributor : Ramiro Godoy-Diana Connect in order to contact the contributor
Submitted on : Thursday, October 7, 2004 - 12:29:27 PM
Last modification on : Wednesday, March 27, 2019 - 4:39:25 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:19:05 PM

Identifiers

  • HAL Id : tel-00007046, version 1

Collections

Citation

Ramiro Godoy Diana. Dynamique des tourbillons pancake en milieu stratifie : diffusion et interaction ondes-tourbillons. Dynamique des Fluides [physics.flu-dyn]. Ecole Polytechnique X, 2004. Français. ⟨tel-00007046⟩

Share

Metrics

Record views

322

Files downloads

403