The Einstein Toolkit Consortium is developing and supporting open software for relativistic astrophysics. Our aim is to provide the core computational tools that can enable new science, broaden our community, facilitate interdisciplinary research and take advantage of emerging petascale computers and advanced cyberinfrastructure.
Performing large three-dimensional time-dependent simulations is a complex numerical task. Managing such simulations, often several at the same time as they execute on different supercomputers, is comparable to herding cats — supercomputers differ in their hardware configuration, available software
... [More], directory structure, queueing systems, queuing policies, and many other relevant properties.
However, these differences are only superficial, and the basic capabilities of supercomputers are very similar. The simulation factory contains a set of abstractions of the tasks which are necessary to set up and successfully finish numerical simulations using the Cactus framework. [Less]
The Llama code is a 3-dimensional multiblock infrastructure with adaptive mesh-refinement for Cactus based on Carpet. It provides different patch systems that cover the simulation domain by a set of overlapping patches. Each of these patches has local cooordinates with a well-defined relation to
... [More] global Cartesian coordinates. However, all computations are carried out using a global Cartesian tensor basis such that complicated tensor transformations between patch systems can be avoided. Information between the different patches is communicated via interpolation in the overlap zones. [Less]
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