Direct Calculation of the Turbulent Dissipation Efficiency in Anelastic Convection release_65vsiin26factelr62qtk35fvu

by Kaloyan Penev, Joseph Barranco, Dimitar Sasselov

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abstracts[] {'sha1': 'cc9fff7ad8067ac8e045b1c20504914c59e3cf1a', 'content': 'The current understanding of the turbulent dissipation in stellar convective\nzones is based on the assumption that the turbulence follows Kolmogorov\nscaling. This assumption is valid for some cases in which the time frequency of\nthe external shear is high (e.g., solar p modes). However, for many cases of\nastrophysical interest (e.g., binary orbits, stellar pulsations, etc.), the\ntimescales of interest lie outside the regime of applicability of Kolmogorov\nscaling. We present direct calculations of the dissipation efficiency of the\nturbulent convective flow in this regime, using simulations of anelastic\nconvection with external forcing. We show that the effects of the turbulent\nflow are well represented by an effective viscosity coefficient, we provide the\nvalues of the effective viscosity as a function of the perturbation frequency\nand compare our results to the perturbative method for finding the effective\nviscosity of Penev et al. that can be applied to actual simulations of the\nsurface convective zones of stars.', 'mimetype': 'text/plain', 'lang': 'en'}
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{'index': 1, 'creator_id': None, 'creator': None, 'raw_name': 'Joseph Barranco', 'given_name': None, 'surname': None, 'role': 'author', 'raw_affiliation': None, 'extra': None}
{'index': 2, 'creator_id': None, 'creator': None, 'raw_name': 'Dimitar Sasselov', 'given_name': None, 'surname': None, 'role': 'author', 'raw_affiliation': None, 'extra': None}
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language en
license_slug ARXIV-1.0
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release_date 2009-10-12
release_stage accepted
release_type article
release_year 2009
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title Direct Calculation of the Turbulent Dissipation Efficiency in Anelastic Convection
version v3
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arxiv.base_id 0810.5370
arxiv.categories ['astro-ph']
arxiv.comments 37 pages, 13 figures
arxiv.journal_ref Astrophys.J.705:285-297,2009