non convergence in solving
 

Dear Friends
I have been getting involved in simulating end-winding of a generator. as you can see in the two pictures below I have one domain and a part of the end winding. my boundary conditions are as follows:
inlet: mass flow rate (from 1 to 20)
outlet: opening pressure
upper and lower parts: periodic
left and right sides: wall
flow: air 25
heat transfer: thermal energy
turbulence: K-e
by the way I have not used boundary layer mesh for not reducing the quality of mesh
in mass flow rate of 1 i did not have any problem in convergence, but by raising the mass flow rate to 6, the RMS of equation decreased up to 1e-3 not lower.
although I have tried a lot recently, I could not find any solution
now i am asking is there anyone help me??
thanks in advance

None of your numbers have units. Numbers without units are pretty meaningless.

Your question is an FAQ: https://www.cfd-online.com/Wiki/Ansy...gence_criteria

Your comment about not having inflation layers is almost certainly a mistake. You should fix this is if are looking for any accuracy in your simulation.