Mesoscale flows in large aspect ratio simulations of turbulent compressible convection

Details Mesoscale flows in large aspect ratio simulations of turbulent compressible convection Mesoscale flows in large aspect ratio simulations of turbulent compressible convection

2006-11-28

arxiv.org/abs/astro-ph/0611843v1

A&A vol. 430, L57-L60 (2005)

Astronomy and Astrophysics

Astrophysics

5 pages, 7 figures (reduced quality) -- published in A&A in 2005 but not uploaded to the arxiv

Scientific paper

10.1051/0004-6361:200400130

We present the results of a very large aspect ratio (42.6) numerical simulation of fully compressible turbulent convection in a polytropic atmosphere, and focus on the properties of large-scale flows. Mesoscale patterns dominate the turbulent energy spectrum. We show that these structures, which had already been observed in Boussinesq simulations by Cattaneo et al. (2001), have a genuine convective origin and do not result directly from collective interactions of the smaller scales of the flow, even though their growth is strongly affected by nonlinear transfers. If this result is relevant to the solar photosphere, it suggests that the dominant convective mode below the Sun's surface may be at mesoscales.

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