[rans] add density in all terms of the RANS models
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This is to include variable density in the the 1-2eq turbulence models.
Explanation, using the K-omega model as an example:
Previously implemented (K):
Introduced in this MR (K):
Previously implemented (
Introduced in this MR (
Introduce this additionally for the:
Fix failing kepsilon wall function test
relevant documentation: https://www.afs.enea.it/project/neptunius/docs/fluent/html/th/node99.htm#eq6.3.8bc
in the production term in the 2-eq models (see: Computational Fluid Dynamics, Versteeg& Malalasekera page 90)