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Impact of radial truncation on global 2D hydrodynamic simulations for a Sun-like model
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Vlaykov, D. G., Baraffe, I., Constantino, T., Goffrey, Tom, Guillet, T., Le Saux, A., Morison, A. and Pratt, J. (2022) Impact of radial truncation on global 2D hydrodynamic simulations for a Sun-like model. Monthly Notices of the Royal Astronomical Society, 514 (1). pp. 715-727. doi:10.1093/mnras/stac1278 ISSN 1365-2966.
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Official URL: https://doi.org/10.1093/mnras/stac1278
Abstract
Stellar convection is a non-local process responsible for the transport of heat and chemical species. It can lead to enhanced mixing through convective overshooting and excitation of internal gravity waves (IGWs) at convective boundaries. The relationship between these processes is still not well understood and requires global hydrodynamic simulations to capture the important large-scale dynamics. The steep stratification in stellar interiors suggests that the radial extent of such simulations can affect the convection dynamics, the IGWs in the stably stratified radiative zone, and the depth of the overshooting layer. We investigate these effects using two-dimensional global simulations performed with the fully compressible stellar hydrodynamics code MUSIC. We compare eight different radial truncations of the same solar-like stellar model evolved over approximately 400 convective turnover times. We find that the location of the inner boundary has an insignificant effect on the convection dynamics, the convective overshooting and the travelling IGWs. We relate this to the background conditions at the lower convective boundary which are unaffected by the truncation, as long as a significantly deep radiative layer is included in the simulation domain. However, we find that extending the outer boundary by only a few percent of the stellar radius significantly increases the velocity and temperature perturbations in the convection zone, the overshooting depth, the power and the spectral slope of the IGWs. The effect is related to the background conditions at the outer boundary, which are determined in essence by the hydrostatic stratification and the given luminosity.
Item Type: | Journal Article | ||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||
SWORD Depositor: | Library Publications Router | ||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Convection (Astrophysics), Astrophysics, Stars -- Evolution, Stars -- Structure, Hydrodynamics, Stars | ||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||||||||
Publisher: | Oxford University Press (OUP) | ||||||||||||||||||
ISSN: | 1365-2966 | ||||||||||||||||||
Official Date: | July 2022 | ||||||||||||||||||
Dates: |
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Volume: | 514 | ||||||||||||||||||
Number: | 1 | ||||||||||||||||||
Page Range: | pp. 715-727 | ||||||||||||||||||
DOI: | 10.1093/mnras/stac1278 | ||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||
Re-use Statement: | ** Article version: AM ** From Crossref journal articles via Jisc Publications Router ** History: epub 10-05-2022; issued 10-05-2022. ** Licence for AM version of this article starting on 10-05-2022: https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model | ||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||
Date of first compliant deposit: | 4 November 2022 | ||||||||||||||||||
Date of first compliant Open Access: | 4 November 2022 | ||||||||||||||||||
RIOXX Funder/Project Grant: |
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