Coalescence of lenticular anticyclones in a linearly stratified rotating fluid
| Autor: | Anne Cros, Raúl C. Cruz Gómez, P. Le Gal, A. Orozco Estrada |
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| Přispěvatelé: | Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Coalescence (physics)
Physics [PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn] Critical distance 010504 meteorology & atmospheric sciences Rossby radius of deformation Computational Mechanics Astronomy and Astrophysics Mechanics Vorticity Rotating tank 01 natural sciences Instability 010305 fluids & plasmas Vortex Physics::Fluid Dynamics Geophysics Particle image velocimetry Geochemistry and Petrology Mechanics of Materials 0103 physical sciences 0105 earth and related environmental sciences |
| Zdroj: | Geophysical and Astrophysical Fluid Dynamics Geophysical and Astrophysical Fluid Dynamics, Taylor & Francis, 2020, 114 (4-5), pp.504-523. ⟨10.1080/03091929.2020.1734199⟩ |
| ISSN: | 0309-1929 1029-0419 |
| DOI: | 10.1080/03091929.2020.1734199⟩ |
| Popis: | International audience; This study is devoted to laboratory experiments on the coalescence of two lenticular anticyclones in a linearly stratified rotating fluid. These anticyclones are generated by injecting small volumes of fluid at the center of a rotating tank where a linearly stratified layer was previously prepared with salt. The characteristics of the interaction between the vortices are studied by visualization and Particle Image Velocimetry (PIV) as a function of the initial separation distance between the vortices, the Coriolis parameter of the rotating table and the Brünt-Väisälä frequency of the density stratification. Our results show that the merging critical distance depends drastically on the Rossby radius of deformation of the vortices and are in complete agreement with previous numerical modeling of vortex coalescence. We have also observed that mergers involve three-dimensional processes as the vortices intertwine together possibly because of the presence of an elliptic instability that tilts the vortex cores. They are also accompanied by the emission of vorticity filaments and internal gravity waves radiation although we cannot prove that in our experiments these waves are solely due to the merging process. |
| Databáze: | OpenAIRE |
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