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| Main Author: | |
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| Format: | Preprint |
| Published: |
2025
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| Online Access: | https://arxiv.org/abs/2504.04941 |
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| _version_ | 1866908801261633536 |
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| author | Wang, Lile |
| author_facet | Wang, Lile |
| contents | Thermochemistry, ray-tracing radiation, and radiation-matter interactions are important processes which are computationally difficult to model in astrophysical simulations, addressed by introducing novel algorithms optimized for heterogeneous architectures in the Kratos framework. Key innovations include a stoichiometry-compatible reconstruction scheme for consistent chemical species advection, which ensures element conservation while avoiding matrix inversions, and a LU decomposition method specifically designed for multi-thread parallelization in order to solve stiff thermochemical ordinary differential equations with high efficiency. The framework also implements efficient ray-tracing techniques for radiation transport for radiation-matter interactions. Various verification tests, spanning from chemical advection, combustion, Strömgren spheres, and detonation dynamics, are conducted to demonstrate the accuracy and robustness of Kratos, with results closely matching semi-analytic solutions and benchmarks such as Cantera and the Shock and Detonation Toolbox. The modular design and performance optimizations position it as a versatile tool for studying coupled microphysical processes in the diverse environments of contemporary astrophysical studies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_04941 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Kratos Framework for Heterogeneous Astrophysical Simulations: Ray Tracing, Reacting Flow and Thermochemistry Wang, Lile Instrumentation and Methods for Astrophysics Computational Physics Thermochemistry, ray-tracing radiation, and radiation-matter interactions are important processes which are computationally difficult to model in astrophysical simulations, addressed by introducing novel algorithms optimized for heterogeneous architectures in the Kratos framework. Key innovations include a stoichiometry-compatible reconstruction scheme for consistent chemical species advection, which ensures element conservation while avoiding matrix inversions, and a LU decomposition method specifically designed for multi-thread parallelization in order to solve stiff thermochemical ordinary differential equations with high efficiency. The framework also implements efficient ray-tracing techniques for radiation transport for radiation-matter interactions. Various verification tests, spanning from chemical advection, combustion, Strömgren spheres, and detonation dynamics, are conducted to demonstrate the accuracy and robustness of Kratos, with results closely matching semi-analytic solutions and benchmarks such as Cantera and the Shock and Detonation Toolbox. The modular design and performance optimizations position it as a versatile tool for studying coupled microphysical processes in the diverse environments of contemporary astrophysical studies. |
| title | The Kratos Framework for Heterogeneous Astrophysical Simulations: Ray Tracing, Reacting Flow and Thermochemistry |
| topic | Instrumentation and Methods for Astrophysics Computational Physics |
| url | https://arxiv.org/abs/2504.04941 |