Multidimensional low-Mach number time-implicit hydrodynamic simulations of convective helium shell burning in a massive star

Horst, Leonard; Hirschi, Raphael; Edelmann, Philipp Valentin Ferdinand; Andrássy, Robert; Röpke, Friedrich K.

doi:10.1051/0004-6361/202140825

Title: Multidimensional low-Mach number time-implicit hydrodynamic simulations of convective helium shell burning in a massive star

Journal Article · 07 September 2021 · Astronomy and Astrophysics

DOI: https://doi.org/10.1051/0004-6361/202140825 · OSTI ID:1833258

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^[3]; Andrássy, Robert ^[1];

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Heidelberger Inst. für Theoretische Studien (Germany)
Keele Univ., Staffordshire (United Kingdom); Univ. of Tokyo, Kashiwa (Japan)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Heidelberger Inst. für Theoretische Studien (Germany); Zentrum für Astronomie der Univ. Heidelberg (Germany)

A realistic parametrization of convection and convective boundary mixing in conventional stellar evolution codes is still the subject of ongoing research. Furthermore, to improve the current situation, multidimensional hydrodynamic simulations are used to study convection in stellar interiors. Such simulations are numerically challenging, especially for flows at low Mach numbers which are typical for convection during early evolutionary stages. We explore the benefits of using a low-Mach hydrodynamic flux solver and demonstrate its usability for simulations in the astrophysical context. Simulations of convection for a realistic stellar profile are analyzed regarding the properties of convective boundary mixing. The time-implicit Seven-League Hydro (SLH) code was used to perform multidimensional simulations of convective helium shell burning based on a 25 M_⊙ star model. The results obtained with the low-Mach AUSM⁺-up solver were compared to results when using its non low-Mach variant AUSM_B⁺-up. We applied well-balancing of the gravitational source term to maintain the initial hydrostatic background stratification. The computational grids have resolutions ranging from 180 × 90² to 810 × 540² cells and the nuclear energy release was boosted by factors of 3 × 10³, 1 × 10⁴, and 3 × 10⁴ to study the dependence of the results on these parameters.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1833258

Report Number(s):: LA-UR--21-22119

Journal Information:: Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 653; ISSN 0004-6361

Publisher:: EDP SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Multidimensional low-Mach number time-implicit hydrodynamic simulations of convective helium shell burning in a massive star

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