Hierarchical global solution is switched off
 

Hi all,
I have one line in the fluent console output during the process of one simulation:

Hierarchical global solution is switched off, due to residual increase: 0.00795842->0.0980222

The solution can continue without any problem. I have searched in the forum but I get no related threads. Can anyone show some hint? I guess the "hierarchical global solution" is a kind of multigrid solution?

Anyone knows answer to this?