Under-relaxation-momentum

About:....

Error: AMG Solver ...temperature

Solution:
* by Modification of Under-relaxation of Momentum become less than default (0.7) have to try become 0.6....or: 0.5, 0.4, 0.3, 0.35, 0.39....
for 0.5: 500iteration success but after iteration 701 error AMG Solver again...
for 0.4: error after iteration 1185...
for 0.3: error afater iteration 359...
for 0.35: error after iteration 763...
for 0.39: error after iteration 1750...
for 0.396 or 0.389: have to simulate beside check about Meshing or Coupled Solver and not Segregated...

for 0.396: error after iteration 197...
for 0.389: error after iteration 857...
for 0.37: error after iteration 456...
So, want to check it up of coupled...

conclution for u.r. of momentum is about=0.39 and for pressure is about=0.3

but ok before fixed it...need to set the under-relaxation of Pressure....the default is 0.3 but i have to try the 0.28, 0.29 and 0.32 to know influence of this value...

for this use the same convergence criteria that is 1.0e-06 for all graphics...
for 0.28: error after iteration 1086...
for 0.29: error after iteration 264...
for 0.3: error after iteration 1750...already done
for 0.31: error after iteration 2229...
for 0.32: error after iteration 838...

So, the best configuration based-on under-relaxation of pressure and momentum is 0.31 and 0.39 for this case eventhough it's still has error in AMG solver: temperature.

Now, before try coupled solver....need to try to change the the BC's becouse one says that AMG solver and Reversed flow come from settings in BC's....