Modeling of Turbulent Flows Applied to Numerical Simulations of Galaxy Clusters

Luigi Iapichino (), Jens C. Niemeyer (), Julian Adamek (), Surajit Paul () and Mario Scuderi ()
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Luigi Iapichino: Universität Würzburg, Institut für Theoretische Physik und Astrophysik
Jens C. Niemeyer: Universität Würzburg, Institut für Theoretische Physik und Astrophysik
Julian Adamek: Universität Würzburg, Institut für Theoretische Physik und Astrophysik
Surajit Paul: Universität Würzburg, Institut für Theoretische Physik und Astrophysik
Mario Scuderi: Sezione di Catania, Dipartimento di Fisica e Astronomia dell’Universitá di Catania, and Istituto Nazionale di Fisica Nucleare

A chapter in High Performance Computing in Science and Engineering, Garching/Munich 2007, 2009, pp 45-56 from Springer

Abstract: Abstract FEARLESS (Fluid mEchanics with Adaptively Refined Large Eddy SimulationS) is a novel numerical approach for hydrodynamical simulations of turbulent flows, which combines the use of the adaptive mesh refinement (AMR) with a subgrid scale (SGS) model for the unresolved scales. We report some results of our first research phase, aimed to the test of new AMR criteria suitable for resolving velocity fluctuations. In this first stage of the project, no SGS model was used. Our simulations of a subcluster merger event clearly show that an accurate resolution of the turbulent flow is important not only for following the evolution of the shear instability, but also for its back-reaction on the subcluster core. A better resolution of the turbulent flow can also affect the level of turbulence in the cluster core, according to the first results of our cosmological simulations. Especially in the latter problem, a significant improvement in the modeling is expected from the use of the full FEARLESS implementation.

Date: 2009
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DOI: 10.1007/978-3-540-69182-2_4

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