The Transport of Diluted Species interface supports the inclusion of turbulent mixing via the gradient-diffusion hypothesis which adds the following contribution to the diffusion coefficient tensor:
where νT is the turbulent kinematic viscosity,
ScT is the turbulent Schmidt number and
I is the unit matrix. While having the form of a diffusive contribution,
Equation 8-17 really models a convective phenomenon and it can therefore only be applied along with convection.