EMMA: an adaptive mesh refinement cosmological simulation code with radiative transfer
Abstract
EMMA is a cosmological simulation code aimed at investigating the reionization epoch. It handles simultaneously collisionless and gas dynamics, as well as radiative transfer physics using a moment-based description with the M1 approximation. Field quantities are stored and computed on an adaptive three-dimensional mesh and the spatial resolution can be dynamically modified based on physically motivated criteria. Physical processes can be coupled at all spatial and temporal scales. We also introduce a new and optional approximation to handle radiation: the light is transported at the resolution of the non-refined grid and only once the dynamics has been fully updated, whereas thermo-chemical processes are still tracked on the refined elements. Such an approximation reduces the overheads induced by the treatment of radiation physics. A suite of standard tests are presented and passed by EMMA, providing a validation for its future use in studies of the reionization epoch. The code is parallel and is able to use graphics processing units (GPUs) to accelerate hydrodynamics and radiative transfer calculations. Depending on the optimizations and the compilers used to generate the CPU reference, global GPU acceleration factors between ×3.9 and ×16.9 can be obtained. As a result, vectorization and transfer operations currently prevent bettermore »
- Authors:
-
- Univ. de Strasbourg, Strasbourg (France)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1565490
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 454; Journal Issue: 1; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; methods: numerical; dark ages; reionization; first stars
Citation Formats
Aubert, Dominique, Deparis, Nicolas, and Ocvirk, Pierre. EMMA: an adaptive mesh refinement cosmological simulation code with radiative transfer. United States: N. p., 2015.
Web. doi:10.1093/mnras/stv1896.
Aubert, Dominique, Deparis, Nicolas, & Ocvirk, Pierre. EMMA: an adaptive mesh refinement cosmological simulation code with radiative transfer. United States. https://doi.org/10.1093/mnras/stv1896
Aubert, Dominique, Deparis, Nicolas, and Ocvirk, Pierre. Wed .
"EMMA: an adaptive mesh refinement cosmological simulation code with radiative transfer". United States. https://doi.org/10.1093/mnras/stv1896. https://www.osti.gov/servlets/purl/1565490.
@article{osti_1565490,
title = {EMMA: an adaptive mesh refinement cosmological simulation code with radiative transfer},
author = {Aubert, Dominique and Deparis, Nicolas and Ocvirk, Pierre},
abstractNote = {EMMA is a cosmological simulation code aimed at investigating the reionization epoch. It handles simultaneously collisionless and gas dynamics, as well as radiative transfer physics using a moment-based description with the M1 approximation. Field quantities are stored and computed on an adaptive three-dimensional mesh and the spatial resolution can be dynamically modified based on physically motivated criteria. Physical processes can be coupled at all spatial and temporal scales. We also introduce a new and optional approximation to handle radiation: the light is transported at the resolution of the non-refined grid and only once the dynamics has been fully updated, whereas thermo-chemical processes are still tracked on the refined elements. Such an approximation reduces the overheads induced by the treatment of radiation physics. A suite of standard tests are presented and passed by EMMA, providing a validation for its future use in studies of the reionization epoch. The code is parallel and is able to use graphics processing units (GPUs) to accelerate hydrodynamics and radiative transfer calculations. Depending on the optimizations and the compilers used to generate the CPU reference, global GPU acceleration factors between ×3.9 and ×16.9 can be obtained. As a result, vectorization and transfer operations currently prevent better GPU performance and we expect that future optimizations and hardware evolution will lead to greater accelerations.},
doi = {10.1093/mnras/stv1896},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 454,
place = {United States},
year = {Wed Sep 30 00:00:00 EDT 2015},
month = {Wed Sep 30 00:00:00 EDT 2015}
}
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