Abstract:
The large-scale structures in the ocean and the atmosphere are in geostrophic balance, and a conduit must be found to channel the energy to the small scales where it can be dissipated. In turbulence, this takes the form of an energy cascade, whereas a possible mechanism in a balanced flow is through the formation of fronts, a common occurrence in geophysics. We show that an iconic configuration in laboratory and numerical experiments for the study of turbulence, the so-called Taylor-Green or von Kármán swirling flow, can be suitably adapted to domains with large aspect ratios, leading to the creation of an imposed large-scale vertical shear. To this effect, we use direct numerical simulations of the Boussinesq equations without net rotation and with no small-scale modeling. Various grid spacings are used, up to 20482 × 256 spatial points. The grids are always isotropic, with box aspect ratios of either 1:4 or 1:8. We find that when shear and stratification are comparable, the imposed shear layer resulting from the forcing leads to the formation of fronts and filaments which destabilize and evolve into a turbulent flow in the bulk, with a sizable amount of dissipation and mixing, following a cycle of front creation, instability, and development of turbulence. The results depend on the vertical length scales of shear and stratification. © 2018 Author(s).
Registro:
Documento: |
Artículo
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Título: | Generation of turbulence through frontogenesis in sheared stratified flows |
Autor: | Sujovolsky, N.E.; Mininni, P.D.; Pouquet, A. |
Filiación: | Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, IFIBA, CONICET, Buenos Aires, 1428, Argentina NCAR, P.O. Box 3000, Boulder, CO 80307-3000, United States Laboratory for Atmospheric and Space Physics, CU, Boulder, CO 80309-256, United States
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Palabras clave: | Aspect ratio; Turbulence; Boussinesq equations; Geostrophic balance; Large aspect ratio; Large scale structures; Numerical experiments; Possible mechanisms; Small-scale modeling; Stratified flows; Shear flow |
Año: | 2018
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Volumen: | 30
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Número: | 8
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DOI: |
http://dx.doi.org/10.1063/1.5043293 |
Título revista: | Physics of Fluids
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Título revista abreviado: | Phys. Fluids
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ISSN: | 10706631
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CODEN: | PHFLE
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10706631_v30_n8_p_Sujovolsky |
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Citas:
---------- APA ----------
Sujovolsky, N.E., Mininni, P.D. & Pouquet, A.
(2018)
. Generation of turbulence through frontogenesis in sheared stratified flows. Physics of Fluids, 30(8).
http://dx.doi.org/10.1063/1.5043293---------- CHICAGO ----------
Sujovolsky, N.E., Mininni, P.D., Pouquet, A.
"Generation of turbulence through frontogenesis in sheared stratified flows"
. Physics of Fluids 30, no. 8
(2018).
http://dx.doi.org/10.1063/1.5043293---------- MLA ----------
Sujovolsky, N.E., Mininni, P.D., Pouquet, A.
"Generation of turbulence through frontogenesis in sheared stratified flows"
. Physics of Fluids, vol. 30, no. 8, 2018.
http://dx.doi.org/10.1063/1.5043293---------- VANCOUVER ----------
Sujovolsky, N.E., Mininni, P.D., Pouquet, A. Generation of turbulence through frontogenesis in sheared stratified flows. Phys. Fluids. 2018;30(8).
http://dx.doi.org/10.1063/1.5043293