Journal Article

Hydrodynamical adaptive mesh refinement simulations of turbulent flows – I. Substructure in a wind

L. Iapichino, J. Adamek, W. Schmidt and J. C. Niemeyer

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 388, issue 3, pages 1079-1088
Published in print August 2008 | ISSN: 0035-8711
Published online July 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13137.x
Hydrodynamical adaptive mesh refinement simulations of turbulent flows – I. Substructure in a wind

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The problem of the resolution of turbulent flows in adaptive mesh refinement (AMR) simulations is investigated by means of three-dimensional (3D) hydrodynamical simulations in an idealized setup, representing a moving subcluster during a merger event. AMR simulations performed with the usual refinement criteria based on local gradients of selected variables do not properly resolve the production of turbulence downstream of the cluster. Therefore, we apply novel AMR criteria which are optimised to follow the evolution of a turbulent flow. We demonstrate that these criteria provide a better resolution of the flow past the subcluster, allowing us to follow the onset of the shear instability, the evolution of the turbulent wake and the subsequent back-reaction on the subcluster core morphology. We discuss some implications for the modelling of cluster cold fronts.

Keywords: hydrodynamics; instabilities; turbulence; methods: numerical; galaxies: clusters: general

Journal Article.  6823 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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