湍流的流体动力学自适应网格加密模拟- I。风中的子结构
Hydrodynamical adaptive mesh refinement simulations of turbulent flows - I. Substructure in a wind
摘要：
自适应网格细化（AMR）模拟中的湍流的分辨率的问题进行了研究，通过三维流体动力学模拟在一个理想化的设置，代表一个移动的子集群在合并事件。AMR模拟通常的细化标准的基础上选定的变量的局部梯度不正确解决集群的湍流下游的生产。因此，我们采用新的AMR标准，优化遵循的演变的湍流。我们证明，这些标准提供了一个更好的分辨率的流动过去的子集群，使我们能够遵循的剪切不稳定性的发病，湍流尾流的演变和随后的反反应的子集群核心形态。我们讨论了集群冷锋的建模的一些影响。
英文摘要：
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.
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