Feature turbo interfaces

[joshkellyjak]

Proposed Changes

There were some merge issues in the previous pull request that were causing lots of issues in #2209. Hopefully this is resolved here.

Update to the interface initialisation to enable both mixing plane and sliding interfaces within the same turbomachinery simulation. Addition of mass flow outlet to Giles BC.

Related Work

This issue solves a problem reported by a number of users, when simulating radial turbomachinery cases a second-order accurate solution cannot be achieved in some cases when using mixing plane interfaces. This is due to circumfrential averaging in regions where the flow exhibits large circumfrential nonuniformity and/or interspace gaps between adjacent blade-rows/zones small. This issue has been reported by @LorenzoFabris, in a presentation at the SU2 Conference 2022 "Performance Analysis and Shape Optimization of a Radial Compressor with the Open-Source Software SU2" and by myself.

Mass flow outlet included in the PR as requested by users.

PR Checklist

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• I am submitting my contribution to the develop branch.
• My contribution generates no new compiler warnings (try with --warnlevel=3 when using meson).
• My contribution is commented and consistent with SU2 style (https://su2code.github.io/docs_v7/Style-Guide/).
• I used the pre-commit hook to prevent dirty commits and used pre-commit run --all to format old commits.
• I have added a test case that demonstrates my contribution, if necessary.
• I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp), if necessary.

[joshkellyjak]

OK this looks to have solved the merge issues, thanks again @bigfooted @jblueh. Still to do is include the testcase I showed in the developer meetings and update the regression tests due to the bug fix in the mixing plane.