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Artículo

Quantification of the strength of inertial waves in a rotating turbulent flow

Clark Di Leoni, PatricioIcon ; Cobelli, Pablo JavierIcon ; Mininni, Pablo DanielIcon ; Dmitruk, Pablo ArielIcon ; Matthaeus, William
Fecha de publicación: 03/2014
Editorial: American Institute of Physics
Revista: Physics of Fluids
ISSN: 1070-6631
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

We quantify the strength of the waves and their impact on the energy cascade in rotating turbulence by studying the wave number and frequency energy spectrum, and the time correlation functions of individual Fourier modes in numerical simulations in three dimensions in periodic boxes. From the spectrum, we find that a significant fraction of the energy is concentrated in modes with wave frequency ω ≈ 0, even when the external forcing injects no energy directly into these modes. However, for modes for which the period of the inertial waves τω is faster than the turnover time τNL, a significant fraction of the remaining energy is concentrated in the modes that satisfy the dispersion relation of the waves. No evidence of accumulation of energy in the modes with τω = τNL is observed, unlike what critical balance arguments predict. From the time correlation functions, we find that for modes with τω < τsw (with tsw the sweeping time) the dominant decorrelation time is the wave period, and that these modes also show a slower modulation on the timescale tNL as assumed in wave turbulence theories. The rest of the modes are decorrelated with the sweeping time, including the very energetic modes with ω ≈ 0. © 2014 AIP Publishing LLC.
Palabras clave: Turbulence , Rotating Flows , Swirling Flows , Direct Numerical Simulations
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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/11336/77184
URL: http://scitation.aip.org/content/aip/journal/pof2/26/3/10.1063/1.4868280?ver=pdf
DOI: http://dx.doi.org/10.1063/1.4868280
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Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Citación
Clark Di Leoni, Patricio; Cobelli, Pablo Javier; Mininni, Pablo Daniel; Dmitruk, Pablo Ariel; Matthaeus, William; Quantification of the strength of inertial waves in a rotating turbulent flow; American Institute of Physics; Physics of Fluids; 26; 3; 3-2014; 3510601-3510615
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