Casey Meakin
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View article: Stellar Evolution and Convection in 3D Hydrodynamic Simulations of a Complete Burning Phase
Stellar Evolution and Convection in 3D Hydrodynamic Simulations of a Complete Burning Phase Open
Our understanding of stellar evolution and nucleosynthesis is limited by the uncertainties coming from the complex multi-dimensional processes in stellar interiors, such as convection and nuclear burning. Three-dimensional stellar models c…
View article: Shell mergers in the late stages of massive star evolution: new insight from 3D hydrodynamic simulations
Shell mergers in the late stages of massive star evolution: new insight from 3D hydrodynamic simulations Open
One-dimensional (1D) stellar evolution models are widely used across various astrophysical fields, however they are still dominated by important uncertainties that deeply affect their predictive power. Among those, the merging of independe…
View article: Turbulence and nuclear reactions in 3D hydrodynamics simulations of massive stars
Turbulence and nuclear reactions in 3D hydrodynamics simulations of massive stars Open
Our knowledge of massive star evolution and nucleosynthesis is limited by uncertainties related to multi-dimensional processes taking place in stellar interiors. Recently, theoretical works have started to improve 1D stellar evolution code…
View article: High Velocity Impact Testing for Evaluation of Intermetallic Projectiles
High Velocity Impact Testing for Evaluation of Intermetallic Projectiles Open
Experiments were performed to study penetration through multiple aluminum plates followed by impact into an inert steel anvil using a High-velocity Impact-ignition Testing System (HITS). The projectiles are intermetallic pellets launched f…
View article: 3D Simulations and MLT: II. Onsager's Ideal Turbulence
3D Simulations and MLT: II. Onsager's Ideal Turbulence Open
We simulate stellar convection at high Reynolds number (Re$\lesssim$7000) with causal time stepping but no explicit viscosity. We use the 3D Euler equations with shock capturing (Colella & Woodward 1984). Anomalous dissipation of turbulent…
View article: 3D simulations and MLT: II. RA-ILES results
3D simulations and MLT: II. RA-ILES results Open
Extending (\citealt{alvio1}), we analyze the physics of the turbulent cascade in stars. Our simulations give an asymptotic limit for the global damping length for turbulent kinetic energy, $\ld \sim \langle u^3 \rangle /\langle \epsilon \r…
View article: Turbulent mixing and nuclear burning in stellar interiors
Turbulent mixing and nuclear burning in stellar interiors Open
The turbulent burning of nuclei is a common phenomenon in the evolution of\nstars. Here we examine a challenging case: the merging of the neon and oxygen\nburning shells in a 23 M$_{\\odot}$ star. A previously unknown quasi-steady\nstate i…
View article: Key issues review: numerical studies of turbulence in stars
Key issues review: numerical studies of turbulence in stars Open
Three major problems of single-star astrophysics are convection, magnetic fields and rotation. Numerical simulations of convection in stars now have sufficient resolution to be truly turbulent, with effective Reynolds numbers of [Formula: …