Quasi-Newton Coupling

[NAnand-TUD]

Hello,

Following our discussion during the conference with @TobiKattmann, I wanted to start the discussion on the quasi-newton coupling for multi-zone problems. I did a bit of reading and found the relevant material and I followed it at least to some extent.

Now, upon a bit of digging, I see that @pcarruscag already implemented this for the FSI problem and is available in feature_fsi_iqn (v6.2.0).

So should we upgrade this method to v8.0.0? So that all other problems can benefit from this? Or are we still missing something in this implementation? Me and @praharsh09 are trying to understand the effort required to have this method in.

Cheers,
Nitish