Fix bugs in Davis EOS's

[buechlerm]

Fix a couple of bugs in the Davis Eos's.

PR Summary

There were a few minor mistakes, but most notably, it was returning something like an isoenergy bulk modulus. It now returns the isentropic bulk modulus

PR Checklist

• Adds a test for any bugs fixed. Adds tests for new features.
• Format your changes by using the make format command after configuring with cmake.
• Document any new features, update documentation for changes made.
• Make sure the copyright notice on any files you modified is up to date.
• After creating a pull request, note it in the CHANGELOG.md file.
• LANL employees: make sure tests pass both on the github CI and on the Darwin CI
• If ML was used, make sure to add a disclaimer at the top of a file indicating ML was used to assist in generating the file.
• If Agentic AI was used, have the AI generate a "proposed changes" markdown file and store it in the plan_histories folder, with a filename the same as the MR number.

If preparing for a new release, in addition please check the following:

• Update the version in cmake.
• Move the changes in the CHANGELOG.md file under a new header for the new release, and reset the categories.
• Maintainers: ensure spackages are up to date:
  • LANL-internal team, update XCAP spackages
  • Current maintainer of upstream spackages, submit MR to spack

[Yurlungur]

Thanks for the fix! @chadmeyer FYI since you are the original author.

[chadmeyer]

This all looks thermodynamically sound to me. Good catch(es)

[chadmeyer]

I can confirm that this looks correct to me. Was the adiabatic bulk modulus, but we want the isentropic bulk modulus.

[chadmeyer]

Assuming this is dF/dvvc Which I think it should be, then I'm fairly certain this n should be there.

[chadmeyer]

Finally, with the fix to Fx and this putting it to the isentropic bulk modulus, this should be correct.

[Yurlungur]

@buechlerm assuming tests are passing on re-git this is good to go from my perspective. Should I click merge?

[buechlerm]

Yes, tests are all passing on re-git.