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| Paper: |
Exploiting the Extensibility of the FLASH Code Architecture for Unsplit Time Integration |
| Volume: |
429, Numerical Modeling of Space Plasma Flows, Astronum-2009 |
| Page: |
247 |
| Authors: |
Lee, D.; Dubey, A.; Olson, K.; Weide, K.; Antypas, K. |
| Abstract: |
FLASH is a component-based massively parallel multiphysics simulation
code with a wide user base. The time integration in FLASH was
originally designed using Strang operator splitting for
hydrodynamics. In version 3 of the FLASH release, we added an Unsplit
Staggered Mesh Magnetohydrodynamics (USM-MHD) solver based on the
constrained transport method of Lee and Deane.
This method tested and exercised the modularity and
extensibility of the FLASH code architecture, with abstraction of time integration and solution mesh from solvers being the focus. In this paper we present the relevant architectural details
of the FLASH code that facilitated the incorporation of unsplit time
integration into a primarily directionally split
framework. Additionally, we discuss the challenges posed by adaptive
mesh refinement to the USM-MHD solver and their solutions.
Finally we present analysis of the relative computational performance
split versus unsplit methods, and also the weak scaling performance of
the unsplit USM-MHD solver in a parallel environment. |
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