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Title: EMMA: an adaptive mesh refinement cosmological simulation code with radiative transfer

Journal Article · · Monthly Notices of the Royal Astronomical Society

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1565490
Journal Information:
Monthly Notices of the Royal Astronomical Society, Vol. 454, Issue 1; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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  • Kravtsov, Andrey V.; Klypin, Anatoly A.; Khokhlov, Alexei M.
  • The Astrophysical Journal Supplement Series, Vol. 111, Issue 1 https://doi.org/10.1086/313015
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Cited By (15)

Impact of the reduced speed of light approximation on the post-overlap neutral hydrogen fraction in numerical simulations of the epoch of reionization journal June 2019
Cosmic reionisation journal April 2019
Cosmic Dawn (CoDa): the first radiation-hydrodynamics simulation of reionization and galaxy formation in the Local Universe journal August 2016
Simulating an isolated dwarf galaxy with multichannel feedback and chemical yields from individual stars journal October 2018
The Goldilocks problem of the quasar contribution to reionization journal December 2018
Inferring the astrophysics of reionization and cosmic dawn from galaxy luminosity functions and the 21-cm signal journal January 2019
A deep learning model to emulate simulations of cosmic reionization journal September 2019
Properties of reionization-era galaxies from JWST luminosity functions and 21-cm interferometry journal November 2019
Challenges and Techniques for Simulating Line Emission journal September 2018
The Inhomogeneous Reionization Times of Present-day Galaxies journal March 2018
Cosmic Dawn (CoDa): the first radiation-hydrodynamics simulation of reionization and galaxy formation in the Local Universe text January 2016
The Inhomogeneous Reionization Times of Present-day Galaxies text January 2018
Impact of the reduced speed of light approximation on the post-overlap neutral hydrogen fraction in numerical simulations of the epoch of reionization text January 2018
Inferring the astrophysics of reionization and cosmic dawn from galaxy luminosity functions and the 21-cm signal text January 2018
An Introductory Review on Cosmic Reionization text January 2019

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