reverse flow and divergence in AMG solver

MASOUD · March 31, 2010, 01:12

reversed flow in 24 faces on outflow 43.

reversed flow in 25 faces on outflow 55.
temperature limited to 1.000000e+000 in 13 cells on zone 31 in domain 1
temperature limited to 5.000000e+003 in 11 cells on zone 31 in domain 1
temperature limited to 1.000000e+000 in 5 cells on zone 32 in domain 1
temperature limited to 5.000000e+003 in 3 cells on zone 32 in domain 1
temperature limited to 1.000000e+000 in 1300 cells on zone 34 in domain 1

Error: Divergence detected in AMG solver: uds-0

Error: Divergence detected in AMG solver: uds-0
Error Object: #f

*******************************

WHY?????

Chris D · March 31, 2010, 08:12

I would first check the grid where you're hitting the solution limits. Maybe the cells are highly skewed, or there is a sharp edge?

heidar · April 2, 2010, 08:48

i am agree by th following answer. i encounter to this problem as u i solved it by increasing the mesh density.

March 31, 2010, 01:12	reverse flow and divergence in AMG solver	#1
MASOUD Senior Member MASOUD Join Date: Mar 2009 Posts: 102 Rep Power: 18	reversed flow in 24 faces on outflow 43. reversed flow in 25 faces on outflow 55. temperature limited to 1.000000e+000 in 13 cells on zone 31 in domain 1 temperature limited to 5.000000e+003 in 11 cells on zone 31 in domain 1 temperature limited to 1.000000e+000 in 5 cells on zone 32 in domain 1 temperature limited to 5.000000e+003 in 3 cells on zone 32 in domain 1 temperature limited to 1.000000e+000 in 1300 cells on zone 34 in domain 1 Error: Divergence detected in AMG solver: uds-0 Error: Divergence detected in AMG solver: uds-0 Error Object: #f ******************************* WHY?????

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March 31, 2010, 08:12		#2
Chris D Senior Member Chris Join Date: Jul 2009 Location: Ohio, USA Posts: 169 Rep Power: 17	I would first check the grid where you're hitting the solution limits. Maybe the cells are highly skewed, or there is a sharp edge?

April 2, 2010, 08:48	hi	#3
heidar Member heidar jafarizadeh Join Date: Mar 2010 Location: Iran- Tehran Posts: 43 Rep Power: 17	i am agree by th following answer. i encounter to this problem as u i solved it by increasing the mesh density.