[ashish.svm]

I have two domains in my model. I am solving for pressure in these two domains, and these two domains are connected by flow transfer between each other.

But, second domain only exists on a subset of the full mesh. So the pressure in the second domain is not defined for all mesh cells. How can we create a field which is defined only for selected cell?

Alternatively, I tried to solve the second domain equation on whole mesh (as suggested in another forum conditional solving of transport equation ), but for a lot of cells where the second domain is not defined leads to 0=0 trivial equation while solving for fvscalar matrix equation.