Higher-order magnetohydrodynamic numerics
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In this chapter, we aim at presenting the basic techniques necessary to go beyond the widely accepted paradigm of second-order numerics. We specifically focus on finite-volume schemes for hyperbolic conservation laws occuring in fluid approximations such as the equations of ideal magnetohydrodynamics or the Euler equations of gas dynamics. For the sake of clarity, a simple fourth-order ideal magnetohydrodynamic (MHD) solver which allows to simulate strongly shocked systems serves as an instructive example. Issues that only or mainly arise in the world of higher-order numerics are given specific focus. Alternative algorithms as well as refinements and improvements are dicussed and are referenced to in the literature. As an example of application, some results on decaying compressible turbulence are presented.
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