Imposing a Lagrangian particle framework on an Eulerian hydrodynamics infrastructure in flash

A. Dubey, C. Daley, J. Zuhone, P. M. Ricker, K. Weide, C. Graziani

Research output: Contribution to journalArticle

Abstract

In many astrophysical simulations, both Eulerian and Lagrangian quantities are of interest. For example, in a galaxy cluster merger simulation, the intracluster gas can have Eulerian discretization, while dark matter can be modeled using particles. FLASH, a component-based scientific simulation code, superimposes a Lagrangian framework atop an adaptive mesh refinement Eulerian framework to enable such simulations. The discretization of the field variables is Eulerian, while the Lagrangian entities occur in many different forms including tracer particles, massive particles, charged particles in particle-in-cell mode, and Lagrangian markers to model fluid-structure interactions. These widely varying roles for Lagrangian entities are possible because of the highly modular, flexible, and extensible architecture of the Lagrangian framework. In this paper, we describe the Lagrangian framework in FLASH in the context of two very different applications, Type Ia supernovae and galaxy cluster mergers, which use the Lagrangian entities in fundamentally different ways.

Original languageEnglish (US)
Article number27
JournalAstrophysical Journal, Supplement Series
Volume201
Issue number2
DOIs
StatePublished - Aug 2012

Keywords

  • galaxies: clusters: general
  • hydrodynamics
  • methods: numerical
  • supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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