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| Paper: |
A New Multidimensional Unsplit MHD Solver in FLASH3 |
| Volume: |
406, Numerical Modeling of Space Plasma Flows: ASTRONUM - 2008 |
| Page: |
243 |
| Authors: |
Lee, D.; Deane, A.E.; Federrath, C. |
| Abstract: |
We present a new unsplit staggered mesh (USM) magnetohydrodynamics (MHD) scheme for the solution of time evolving, multi-dimensional, compressible MHD flows which is implemented in the publicly available code suite, FLASH3. The implementation uses uniform or block adaptive mesh refinement (AMR) grids on a variety of parallel computing architectures. The scheme preserves the divergence-free constraint of the magnetic fields to machine accuracy by using staggered meshes. The USM scheme obtains second-order accuracy by adopting a new data reconstruction-evolution algorithm for solving the associated Riemann problem. In this data reconstruction-evolution step a set of multidimensional MHD terms proportional to ∇·B are explicitly included that maintain in-plane dynamics. The scheme also emphasizes accuracy and efficiency in calculating electric fields in a new modified electric field construction algorithm (MEC). We present two example applications for the USM scheme that demonstrate the excellent performance of the new solver. |
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