KelvinHelmholtz: Kelvin-Helmholtz Instability
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.. sectionauthor:: Axel Huebl <a.huebl (at) hzdr.de>
.. moduleauthor:: Axel Huebl <a.huebl (at) hzdr.de>, E. Paulo Alves, Thomas Grismayer

This example simulates a shear-flow instability known as the Kelvin-Helmholtz Instability in a near-relativistic setup as studied in [Alves12]_, [Grismayer13]_, [Bussmann13]_.
The default setup uses a pre-ionized quasi-neutral hydrogen plasma.
Modifiying the ion species' mass to resample positrons instead is a test we perform regularly to control numerical heating and charge conservation.

References
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.. [Alves12]
       E.P. Alves, T. Grismayer, S.F. Martins, F. Fiuza, R.A. Fonseca, L.O. Silva.
       *Large-scale magnetic field generation via the kinetic kelvin-helmholtz instability in unmagnetized scenarios*,
       The Astrophysical Journal Letters (2012),
       https://dx.doi.org/10.1088/2041-8205/746/2/L14

.. [Grismayer13]
       T. Grismayer, E.P. Alves, R.A. Fonseca, L.O. Silva.
       *dc-magnetic-field generation in unmagnetized shear flows*,
       Physical Reveview Letters (2013),
       https://doi.org/10.1103/PhysRevLett.111.015005

.. [Bussmann13]
       M. Bussmann, H. Burau, T.E. Cowan, A. Debus, A. Huebl, G. Juckeland, T. Kluge, W.E. Nagel, R. Pausch, F. Schmitt, U. Schramm, J. Schuchart, R. Widera.
       *Radiative Signatures of the Relativistic Kelvin-Helmholtz Instability*,
       Proceedings of the International Conference on High Performance Computing, Networking, Storage and Analysis (2013),
       http://doi.acm.org/10.1145/2503210.2504564