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Divergence detected in AMG solver: pressure correction

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Old   February 20, 2013, 13:40
Default Divergence detected in AMG solver: pressure correction
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Xinquan
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Hi,

I was trying to run multiphase flow simulation with interfacial transfer modeling. When I added more interfacial transfer terms into play and tried to run the calculation. A problem window pops up and the errors are shown below.



# Divergence detected in AMG solver: mp-x-momentum -> Decreasing coarsening group size!
# Divergence detected in AMG solver: mp-x-momentum -> Increasing relaxation sweeps!
Interrupting...
# Divergence detected in AMG solver: pressure correction -> Turning off correction scaling!
# Divergence detected in AMG solver: pressure correction -> Increasing relaxation sweeps!

I was trying to adjust the solution controls-multigrid but it seemed that it didn't work at all. I was wondering if there is anyone knowing how exactly I should tune all these parameters.

Thank you a bunch. Your advise will be appreciated!
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Old   July 18, 2014, 09:31
Default pressure correction
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azadehkhalili
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Hi
I have the same problem of: Divergence detected in AMG solver: pressure correction in an Eulerian multiphase model.
can you solve it?
I don't have any idea about that.

could someone explain me more what is it about?
thanks.
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Old   July 21, 2014, 04:38
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Jackson Sim
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I have heard from others that using eulerian model with multiphase flow will result in divergence with steady state flow.

Why not try using transient flow with small step time?
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Old   July 21, 2014, 04:44
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Hi
thank's for your answer.
I have done this case with unsteady flow too but again this error apeared.
I don't know what do i do any more.
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Old   July 21, 2014, 04:47
Default divergence detected in AMG Solver
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Hi,
My idea is problem in your mesh...The same case happened with me also...also try reducing the under relaxation parameters...hope this works.....
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Old   July 21, 2014, 04:49
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thank's alot for your help.
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