Debugging Convergence Issues

Hello!

I am working on a coupled fluid dynamics / elastic deformation system of PDEs, and I am running into convergence issues. I have tried updating the initial guess, playing around with parameters, non-dimensionalizing the equations, and checking the variational form (I have checked with my instructor; he says they are correct and I also believe that they are correct). However, I am still unable to run this system of PDEs on my computer. Can anyone suggest things that worked for them when working through convergence issues?

Thanks,
Valencia

Without an actual example of your code it is really hard to give any guidance.