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reverse flow and divergence in AMG solver

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Old   March 31, 2010, 01:12
Default reverse flow and divergence in AMG solver
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MASOUD
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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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Old   March 31, 2010, 08:12
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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?
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Old   April 2, 2010, 08:48
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heidar jafarizadeh
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i am agree by th following answer. i encounter to this problem as u i solved it by increasing the mesh density.
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