2025/04/07 by Wang, Lile
Engineering · Mathematics · #Combustion and Detonation Processes #Combustion and flame dynamics #Computational Physics (physics.comp-ph) #FOS: Physical sciences #Gas Dynamics and Kinetic Theory #Instrumentation and Methods for Astrophysics (astro-ph.IM)
paper · pdf · doi:10.48550/arxiv.2504.04941
openalex publication_date 2025/04/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.