Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-30
Astronomy and Astrophysics
Astrophysics
11 pages, 14 figures. Small changes to match the version accepted by MNRAS
Scientific paper
10.1111/j.1365-2966.2008.13137.x
The problem of the resolution of turbulent flows in adaptive mesh refinement (AMR) simulations is investigated by means of 3D hydrodynamical simulations in an idealised 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.
Adamek Jiri
Iapichino Luigi
Niemeyer Jens C.
Schmidt Wolfram
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