KNOWN ISSUE: Reynolds stress modelling with GGI fluid-fluid domain interfaces (Class 3 Error)
If a Reynolds stress turbulence model is used for a case which includes a fluid-fluid domain interface, then the accuracy of the solution is degraded.
This is because the momentum equations do not use the full Reynolds stress model at the domain interface, and just use an isotropic eddy-viscosity assumption.
No workaround is currently available.
No fix is currently available.