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Artículo

Absorption of waves by large-scale winds in stratified turbulence

Clark Di Leoni, PatricioIcon ; Mininni, Pablo DanielIcon
Fecha de publicación: 03/2015
Editorial: American Physical Society
Revista: Physical Review E: Statistical, Nonlinear and Soft Matter Physics
ISSN: 1539-3755
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

The atmosphere is a nonlinear stratified fluid in which internal gravity waves are present. These waves interact with the flow, resulting in wave turbulence that displays important differences with the turbulence observed in isotropic and homogeneous flows. We study numerically the role of these waves and their interaction with the large-scale flow, consisting of vertically sheared horizontal winds. We calculate their space- and time-resolved energy spectrum (a four-dimensional spectrum) and show that most of the energy is concentrated along a dispersion relation that is Doppler shifted by the horizontal winds. We also observe that when uniform winds are let to develop in each horizontal layer of the flow, waves whose phase velocity is equal to the horizontal wind speed have negligible energy. This indicates a nonlocal transfer of their energy to the mean flow. Both phenomena, the Doppler shift and the absorption of waves traveling with the wind speed, are not accounted for in current theories of stratified wave turbulence.
Palabras clave: Stratified Flows , Wave Turbulence , Critical Layer
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/44012
URL: https://journals.aps.org/pre/abstract/10.1103/PhysRevE.91.033015
DOI: http://dx.doi.org/10.1103/PhysRevE.91.033015
Colecciones
Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Citación
Clark Di Leoni, Patricio; Mininni, Pablo Daniel; Absorption of waves by large-scale winds in stratified turbulence; American Physical Society; Physical Review E: Statistical, Nonlinear and Soft Matter Physics; 91; 3; 3-2015; 330151-330157
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