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Abstract:

We investigate the large-scale intermittency of vertical velocity and temperature, and the mixing properties of stably stratified turbulent flows using both Lagrangian and Eulerian fields from direct numerical simulations of the Boussinesq equations with periodic boundary conditions, in a parameter space relevant for the atmosphere and the oceans. Over a range of Froude numbers of geophysical interest (≈ 0.05-0.3) we observe very large fluctuations of the vertical components of the velocity and the potential temperature, localized in space and time, with a sharp transition leading to non-Gaussian wings of the probability distribution functions. This behavior is captured by a simple model representing the competition between gravity waves on a fast time scale and nonlinear steepening on a slower time scale. The existence of a resonant regime characterized by enhanced large-scale intermittency, as understood within the framework of the proposed model, is then linked to the emergence of structures in the velocity and potential temperature fields, localized overturning and mixing. Finally, in the same regime we observe a linear scaling of the mixing efficiency with the Froude number and an increase of its value of roughly one order of magnitude. © EPLA, 2018.

Registro:

Documento: Artículo
Título:Vertical drafts and mixing in stratified turbulence: Sharp transition with Froude number
Autor:Feraco, F.; Marino, R.; Pumir, A.; Primavera, L.; Mininni, P.D.; Pouquet, A.; Rosenberg, D.
Filiación:Laboratoire de Mécanique des Fluides et d'Acoustique, CNRS, École Centrale de Lyon, Université Claude Bernard Lyon 1, INSA de Lyon, Écully, F-69134, France
Dipartimento di Fisica, Università della Calabria, Arcavacata di Rende (CS), Italy
Université de Lyon, ENS de Lyon, Université Claude Bernard, CNRS, Laboratoire de Physique, Lyon, F-69342, France
Max-Planck Institute for Dynamics and Self-Organization, Göttingen, D-37077, Germany
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, IFIBA, CONICET, Buenos Aires, 1428, Argentina
Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80309, United States
National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307, United States
1401 Bradley Drive, Boulder, CO 80305, United States
Año:2018
Volumen:123
Número:4
DOI: http://dx.doi.org/10.1209/0295-5075/123/44002
Título revista:EPL
Título revista abreviado:EPL
ISSN:02955075
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02955075_v123_n4_p_Feraco

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Citas:

---------- APA ----------
Feraco, F., Marino, R., Pumir, A., Primavera, L., Mininni, P.D., Pouquet, A. & Rosenberg, D. (2018) . Vertical drafts and mixing in stratified turbulence: Sharp transition with Froude number. EPL, 123(4).
http://dx.doi.org/10.1209/0295-5075/123/44002
---------- CHICAGO ----------
Feraco, F., Marino, R., Pumir, A., Primavera, L., Mininni, P.D., Pouquet, A., et al. "Vertical drafts and mixing in stratified turbulence: Sharp transition with Froude number" . EPL 123, no. 4 (2018).
http://dx.doi.org/10.1209/0295-5075/123/44002
---------- MLA ----------
Feraco, F., Marino, R., Pumir, A., Primavera, L., Mininni, P.D., Pouquet, A., et al. "Vertical drafts and mixing in stratified turbulence: Sharp transition with Froude number" . EPL, vol. 123, no. 4, 2018.
http://dx.doi.org/10.1209/0295-5075/123/44002
---------- VANCOUVER ----------
Feraco, F., Marino, R., Pumir, A., Primavera, L., Mininni, P.D., Pouquet, A., et al. Vertical drafts and mixing in stratified turbulence: Sharp transition with Froude number. EPL. 2018;123(4).
http://dx.doi.org/10.1209/0295-5075/123/44002