turbulent diffusion term in transport equation for additional variables
 

Hi, all
Now I want to solve a transport equation for an additional variable with a
steady flow field . My equation is expressed in the form as below.

It seems turbulent diffusion term will disappear in 2 cases. One is in laminar
flow and the other is in diffusion transport equation or poisson equation.
In the Source term, the eddy dissipation is still used so I can't shift to laminar flow.
So is there any way to exclude turbulent diffusion term in transport equations?
Thanks.

You could set the Turbulent Schmidt Number to a large value, and this will reduce (or eliminate depending how large the value you choose) the turbulent diffusion term

Yes, it may work. When I try to set Sc with a value of 1E+10, it's hard to converge. I may need to try a smaller value once more. Thank you.