期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 388, 期 3, 页码 1079-1088出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2008.13137.x
关键词
hydrodynamics; instabilities; turbulence; methods : numerical; galaxies : clusters : general
资金
- Alfried Krupp Prize for Young University Teachers of the Alfried Krupp von Bohlen und Halbach Foundation
The problem of the resolution Of turbulent flows in adaptive mesh refinement (AMR) sirnulations 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.
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