Yes, there is a perforated pipe burried under soil with EWF on for condensation, soil is modeled as porous zone. I have tried it with 1.2 as growth rate and cell count of 62 millions and it still diverged with the reverse flow at pressure outlet and floating point exception. Fluent was initializing and starting the calculation extremely slow, so I increased the growth rate to reduce the cell count and attached images are for after changing the growth rate from 1.2 to 1.5 and cell count from 62 to 7 millions. I had run the same geometry with diffrent porous coefficients and 0.5 fluid porousity (mentioned above) and reached convergece, but after changing porous coefficients (higher values) and fluid porosity to 0.25, it has been diverging.