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Title:
A test suite for quantitative comparison of hydrodynamic codes in astrophysics
Authors:
Tasker, Elizabeth J.; Brunino, Riccardo; Mitchell, Nigel L.; Michielsen, Dolf; Hopton, Stephen; Pearce, Frazer R.; Bryan, Greg L.; Theuns, Tom
Affiliation:
AA(Department of Astronomy, University of Florida, Gainesville, FL 32611, USA), AB(Department of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD), AC(Department of Physics, Institute for Computational Cosmology, University of Durham, South Road, Durham DH1 3LE), AD(Department of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD), AE(Department of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD), AF(Department of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD), AG(Department of Astronomy, Columbia University, New York, NY 10027, USA), AH(Department of Physics, Institute for Computational Cosmology, University of Durham, South Road, Durham DH1 3LE; Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 390, Issue 3, pp. 1267-1281. (MNRAS Homepage)
Publication Date:
11/2008
Origin:
MNRAS
MNRAS Keywords:
hydrodynamics , methods: numerical , cosmology: theory
DOI:
10.1111/j.1365-2966.2008.13836.x
Bibliographic Code:
2008MNRAS.390.1267T

Abstract

We test four commonly used astrophysical simulation codes, ENZO, FLASH, GADGET and HYDRA, using a suite of numerical problems with analytic initial and final states. Situations similar to the conditions of these tests, a Sod shock, a Sedov blast, and both a static and translating King sphere, occur commonly in astrophysics, where the accurate treatment of shocks, sound waves, supernovae explosions and collapsed haloes is a key condition for obtaining reliable validated simulations. We demonstrate that comparable results can be obtained for Lagrangian and Eulerian codes by requiring that approximately one particle exists per grid cell in the region of interest. We conclude that adaptive Eulerian codes, with their ability to place refinements in regions of rapidly changing density, are well suited to problems where physical processes are related to such changes. Lagrangian methods, on the other hand, are well suited to problems where large density contrasts occur and the physics are related to the local density itself rather than the local density gradient.
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