Composition-dependent viscosity and thermal conductivity models for incompresible flows

[Cristopher-Morales]

Proposed Changes

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Part 2/3 of fluid mixing model. In this part, viscosity, thermal conductivity and other properties based on species mass fractions have been added.

Related Work

Resolve any issues (bug fix or feature request), note any related PRs, or mention interactions with the work of others, if any.

It is the continuation of the previous pull request of mixing density #1620.

PR Checklist

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• [X ] I am submitting my contribution to the develop branch.
• [X ] My contribution generates no new compiler warnings (try with the '-Wall -Wextra -Wno-unused-parameter -Wno-empty-body' compiler flags, or simply --warnlevel=2 when using meson).
• My contribution is commented and consistent with SU2 style.
• 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.

[Cristopher-Morales]

Aside from my last two comments, and the possibility I broke the code :), this looks ready. Is this missing anything, or is it ready to merge?

Thank you so much @pcarruscag for your feedback. there is one thing left, it is about the residuals of the test case (species2_primitiveVenturi_mixingmodel.cfg) that I added in the previous pull request, they have changed exceeding in some outputs the tolerance 0.00001 with respect to the values stored in the parallel_regression.py, however the test case converges very well, so could it be possible to modify the values stored in that test case in order to not have this discrepancy between values stored and computed? Thank you so much in advance!!

[pcarruscag]

Have you run that case to convergence before and after and compared the outputs it is computing? If it converges to the same values it's fine.

[pcarruscag]

This was not needed at the moment, if you want to add it please do so also for the other solvers.

To clarify on my comment, do composition-dependent properties work with non-dimensional simulations? or not?
If they don't and the fix is not easy we need to throw an error.
If they do we need a regression test.

[Cristopher-Morales]

Thank you so much for the explanation. I will check whether it works for Non-dimensional simulations.