MHD Multicomponent

[Cczernik]

Implementing 1D Euler multicomponent equations as well as 1D/2D Ideal MHD multicomponent equations.

[sloede]

In general, this LGTM (with some comments). I have not fully reviewed the equation files... if this is also necessary in your opinion, please let me know.

[sloede]

LGTM in general. Some minor changes left to fix.

[sloede]

The code looks good, but please fix coverage.

[sloede]

@Cczernik Could you also please show some performance comparisons (e.g., the timer output of the summary callback) for the new systems, at least for the 2D version? For reference, it would be interesting to see how it fares against MHD without multicomponent or against Euler multicomponent.

[Cczernik]

@Cczernik Could you also please show some performance comparisons (e.g., the timer output of the summary callback) for the new systems, at least for the 2D version? For reference, it would be interesting to see how it fares against MHD without multicomponent or against Euler multicomponent.

@sloede Here you can see an mhd multicomponent example with two components in 2D:

and without multicomponent

[ranocha]

Here you can see an mhd multicomponent example with one component in 2D:

Why are the time step sizes different (different number of RHS calls)?

[Cczernik]

Here you can see an mhd multicomponent example with one component in 2D:

Why are the time step sizes different (different number of RHS calls)?

@ranocha I ran the test with different gammas.. my bad. Fixed it: