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Pulsed Power Technology ALEGRA Simulation Code

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  Z-Machine
Time-exposure photograph of electrical flashover arcs produced over the surface of the water in the accelerator tank as a byproduct of Z operation. These flashovers are much like strokes of lightning.


ALEGRA (Arbitrary Lagrangian Eulerian General Research Application) is being developed to simulate behavior involving strong shock waves that are difficult or impossible for traditional codes to solve. The code uses an ALE algorithm on an unstructured finite element mesh that combines the features of modern Eulerian shock codes with modern Lagrangian solid dynamics codes. In addition, magnetohydrodynamics (MHD) is being added for simulations of high energy density plasma (such as z pinches). ALEGRA is designed to run on distributed memory parallel computers using Single Program Multiple Data (SPMD) paradigm.

Here are some ALEGRA animations.

Animation of a 10-wire array on the Z accelerator Rayleigh-Taylor instability Animation of a cylindrical plasma in the Z accelerator
17.4Mbytes 13.9Mbytes 11.8Mbytes
     
Animation of a 30-wire array in a 9-slot can on the Z accelerator Bennett pinch instability of a wire in the Z accelerator Animation Simulation 4 closely placed wires in a 16-wire array, using Magpie experimental data.
1.1Mbytes 849.5Mbytes 1.1Mbytes

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