Modeling Solids in Nuclear Astrophysics with Smoothed Particle Hydrodynamics

Sagert, I.; Korobkin, O.; Tews, I.; Tsao, B. -J.; Lim, H.; Falato, M.; Loiseau, J.

doi:10.3847/1538-4365/acdc94

Title: Modeling Solids in Nuclear Astrophysics with Smoothed Particle Hydrodynamics

Journal Article · 09 August 2023 · The Astrophysical Journal. Supplement Series

DOI: https://doi.org/10.3847/1538-4365/acdc94 · OSTI ID:1994594

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Abstract Smoothed particle hydrodynamics (SPH) is a frequently applied tool in computational astrophysics to solve the fluid dynamics equations governing the systems under study. For some problems, for example when involving asteroids and asteroid impacts, the additional inclusion of material strength is necessary in order to accurately describe the dynamics. In compact stars, that is white dwarfs and neutron stars, solid components are also present. Neutron stars have a solid crust, which is the strongest material known in nature. However, their dynamical evolution, when modeled via SPH or other computational fluid dynamics codes, is usually described as a purely fluid dynamics problem. Here, we present the first 3D simulations of neutron star crustal toroidal oscillations including material strength with the Los Alamos National Laboratory SPH code FleCSPH. In the first half of the paper, we present the numerical implementation of solid material modeling together with standard tests. The second half is on the simulation of crustal oscillations in the fundamental toroidal mode. Here, we dedicate a large fraction of the paper to approaches that can suppress numerical noise in the solid. If not minimized, the latter can dominate the crustal motion in the simulations.

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

Sponsoring Organization:: USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1994594

Report Number(s):: LA-UR-22-30036

Journal Information:: The Astrophysical Journal. Supplement Series, Journal Name: The Astrophysical Journal. Supplement Series Journal Issue: 2 Vol. 267; ISSN 0067-0049

Publisher:: American Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
79 ASTRONOMY AND ASTROPHYSICS
Astrophysical fluid dynamics
Computational methods
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Title: Modeling Solids in Nuclear Astrophysics with Smoothed Particle Hydrodynamics

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