Solution does not converge when source term is added?

I am trying to solve laminar flow in porous media and vapor domain. The vapor domain is attached to porous media. I use laminar flow in vapor domain and flow in porous matrix in the another domain. The porous media has a source term which is about 0.1 Firstly, I solved this problem without the source term and it is converged. When I add the source term, the solution does not converge.
This is also happened if I used free and porous media physics.

Appreciate your help