Solving coupled pde in openfoam
 

Dear Foamers,

I am trying to create a solver for solving coupled PDE.
From my side, I have written the solver and compiled it. Interestingly, there is no compilation error.
But when I run the case, from the very first iteration it is giving me 0 initial residual and 0 final residual which makes my simulation stop just after 5 iterations.
I am very new to this platform. I am sure that I am doing something wrong conceptually. I will really appreciate any help.

I have attached the respective code for your reference.
I need urgent help.