[Bruno Machado]

Hello everyone,

I have two fluid zones and I am solving one UDS in just one of the zone. Unfortunately, in the boundary of these two zones, the gradient of the UDS goes progressively through the zone the UDS is not solved till it reaches 0. The problem is that since my temperature field is computed by the gradient of this scalar, it is distorted by this huge gradient in the border.

In the figure I attached, the red zone is the boundary cell (with the bigger gradient), and it reduces (to green zone) till reach the smaller value (blue zone). I need to define the gradient (in the red zone) equal to 0.

Since I can not change the boundary to wall and define it through the panel, how can I define the gradient of this UDS equal to 0 just in the boundary cells by using UDF?

Thanks for the helping.

[Bruno Machado]

Is there anyone to help me with this? I'm almost finishing the model for my PhD and this is one (of the two) remaining issues.