We introduce CRASH-AMR, a new version of the cosmological radiative transfer (RT) code CRASH, enabled to use refined grids. This new feature allows us to attain higher resolution in our RT simulations and thus to describe more accurately ionization and temperature patterns in high-density regions. We have tested CRASH-AMR by simulating the evolution of an ionized region produced by a single source embedded in gas at constant density, as well as by a more realistic configuration of multiple sources in an inhomogeneous density field. While we find an excellent agreement with the previous version of CRASH when the adaptive mesh refinement (AMR) feature is disabled, showing that no numerical artefact has been introduced in CRASHAMR, when additional refinement levels are used the code can simulate more accurately the physics of ionized gas in high-density regions. This result has been attained at no computational loss, as RT simulations onAMRgrids with maximum resolution equivalent to that of a uniform Cartesian grid can be run with a gain of up to 60 per cent in computational time.

Enabling radiative transfer on AMR grids in CRASH

Graziani, L.
Writing – Original Draft Preparation
;
Ciardi, B.;Miniati, Fabio;
2017

Abstract

We introduce CRASH-AMR, a new version of the cosmological radiative transfer (RT) code CRASH, enabled to use refined grids. This new feature allows us to attain higher resolution in our RT simulations and thus to describe more accurately ionization and temperature patterns in high-density regions. We have tested CRASH-AMR by simulating the evolution of an ionized region produced by a single source embedded in gas at constant density, as well as by a more realistic configuration of multiple sources in an inhomogeneous density field. While we find an excellent agreement with the previous version of CRASH when the adaptive mesh refinement (AMR) feature is disabled, showing that no numerical artefact has been introduced in CRASHAMR, when additional refinement levels are used the code can simulate more accurately the physics of ionized gas in high-density regions. This result has been attained at no computational loss, as RT simulations onAMRgrids with maximum resolution equivalent to that of a uniform Cartesian grid can be run with a gain of up to 60 per cent in computational time.
2017
Cosmology: theory; Methods: numerical; Radiative transfer; Astronomy and Astrophysics; Space and Planetary Science
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/72336
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 6
  • ???jsp.display-item.citation.isi??? 6
  • OpenAlex ND
social impact