March, 2024. arXiv:2403.14786 [astro-ph, physics:nucl-th] version: 1

Paper doi abstract bibtex

Paper doi abstract bibtex

We build on the simplified spectral deferred corrections (SDC) coupling of hydrodynamics and reactions to handle the case of nuclear statistical equilibrium (NSE) and electron/positron captures/decays in the cores of massive stars. Our approach blends a traditional reaction network on the grid with a tabulated NSE state from a very large, ${\}mathcal\{O\}(100)$ nuclei, network. We demonstrate how to achieve second-order accuracy in the simplified-SDC framework when coupling NSE to hydrodynamics, with the ability to evolve the star on the hydrodynamics timestep. We discuss the application of this method to convection in massive stars leading up to core-collapse. We also show how to initialize the initial convective state from a 1D model in a self-consistent fashion. All of these developments are done in the publicly available Castro simulation code and the entire simulation methodology is fully GPU accelerated.

@misc{zingale_strong_2024, title = {Strong {Coupling} of {Hydrodynamics} and {Reactions} in {Nuclear} {Statistical} {Equilibrium} for {Modeling} {Convection} in {Massive} {Stars}}, url = {http://arxiv.org/abs/2403.14786}, doi = {10.48550/arXiv.2403.14786}, abstract = {We build on the simplified spectral deferred corrections (SDC) coupling of hydrodynamics and reactions to handle the case of nuclear statistical equilibrium (NSE) and electron/positron captures/decays in the cores of massive stars. Our approach blends a traditional reaction network on the grid with a tabulated NSE state from a very large, \${\textbackslash}mathcal\{O\}(100)\$ nuclei, network. We demonstrate how to achieve second-order accuracy in the simplified-SDC framework when coupling NSE to hydrodynamics, with the ability to evolve the star on the hydrodynamics timestep. We discuss the application of this method to convection in massive stars leading up to core-collapse. We also show how to initialize the initial convective state from a 1D model in a self-consistent fashion. All of these developments are done in the publicly available Castro simulation code and the entire simulation methodology is fully GPU accelerated.}, urldate = {2024-06-27}, publisher = {arXiv}, author = {Zingale, Michael and Chen, Zhi and Johnson, Eric T. and Katz, Max P. and Clark, Alexander Smith}, month = mar, year = {2024}, note = {arXiv:2403.14786 [astro-ph, physics:nucl-th] version: 1}, keywords = {high energy physics, hydrodynamics, solar physics, uses sympy}, }

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