Kavli Affiliate: Lile Wang
| First 5 Authors: Lile Wang, , , ,
| Summary:
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, Str"omgren 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.
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