elixir_eulergravity_jeans_instability.jl crashes with given CFL

[DanielDoehring]

The example examples/paper_self_gravitating_gas_dynamics/elixir_eulergravity_jeans_instability.jl crashes with the supplied values for CFL Euler and CFL Gravity. With the values from the paper it runs.

[ranocha]

That's bad. I wonder why it wasn't seen in CI. Looks like the change comes from https://github.com/trixi-framework/Trixi.jl/pull/326/files#diff-1c1b525549c1f59356be3f3049d0c2a66582d28e6b4959b17bf5830afc7452dd. I wonder whether it ran back then...
Could you please fix the example by adapting the CFL number? It may also be something different from the values we used in the paper (since Trixi.jl was quite different back then).

[andrewwinters5000]

That is very strange. I wonder if it was related to switching from our hand rolled CarpenterKennedy 5-stage, order 4 implementation to the ODE library...In any case this was a good catch and fix in #2089