Problems with User Defined Scalar

Alberto Cuoci

Hi,

I am trying to solve an additional transport equation using 1 UDS. When I use the non-premixed combustion model (flamelets), FLUENT does not modify the diffusion coefficient for the additional UDS. When I change the corresponding value in the Materials Panel there is no effect on the simulation; the value remains 1 kg/m/s, which is the default value. I also tried to define an external UDF ( DEFINE_DIFFUSIVITY(name, c, t, i) ) to change the default value, but the result is the same.

Do you have any suggestions?

Thanks, Alberto