Roe Solver implemented

I'm on a roll today. The Roe Solver has been successfully implemented into my 1D Hydro code. As with the HLLC solver, I will not post all of the plots for the various tests. However, I did make a density plot for test 1 because there are some interesting things to note. I first ran the test without an entropy fix, and then ran it again with an entropy fix. Comparing those two plots is probably the most interesting thing you can do with the Roe solver. Again, you can see the plots on my buildcode page all the way at the bottom.

I have yet to add documentation to my buildcode page about the approximate solvers, but will do so in the near future. I do not plan on writing many details, but rather just a brief overview of the methodology behind each solver.

Now that I have an understanding of the Roe solver, I can start coding it into AstroBEAR. On second thought, this might be a bit more complicated. I will need to learn more about extending this to 3D and different equations of state.

So for now, I will start reading about higher order Godunov schemes to put into my hydro code.

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