how can i solve this problem about divergence detected in AMG solver

bjkim87 · June 30, 2016, 06:09

hello my name is philip kim.
i have some problems when i am trying to analysis fluid dynamics.
TUI messages is "Divergence detected in AMG solver : pressure coreection -> Turning off correction scaling"
i establish that model is k-e realizable, dynamic mesh was opened(transient solving), and solution method and controls, monitors are default values.
i have tried to change model but it was same.
how can i solve this problems?
i will wait for your responses.
thank you

AHF · June 30, 2016, 06:23

Quote:

Originally Posted by bjkim87

hello my name is philip kim.
i have some problems when i am trying to analysis fluid dynamics.
TUI messages is "Divergence detected in AMG solver : pressure coreection -> Turning off correction scaling"
i establish that model is k-e realizable, dynamic mesh was opened(transient solving), and solution method and controls, monitors are default values.
i have tried to change model but it was same.
how can i solve this problems?
i will wait for your responses.
thank you

what is your problem ?
define it and provide some picture

bjkim87 · June 30, 2016, 22:07

Quote:

Originally Posted by AHF

what is your problem ?
define it and provide some picture

i would like to post a picture on your reply. but i can't and dont know the way how to post it.

message is that
[
# Divergence detected in AMG solver: pressure correction -> Turning off correction scaling!
# Divergence detected in AMG solver: pressure correction -> Increasing relaxation sweeps!

Divergence detected in AMG solver: pressure correction
Divergence detected in AMG solver: pressure correction
reversed flow in 146 faces on pressure-outlet 2.

Divergence detected in AMG solver: pressure correction
Divergence detected in AMG solver: pressure correction
Error at host: floating point exception

turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 2330 cells

Error at Node 0: floating point exception
]

Far · July 1, 2016, 05:02

check : mesh, boundary conditions, scaling/units, solver settings

divergence · July 1, 2016, 07:03

Set your under-relaxation parameters to a lower level (especially momentum and turbulence). Also I would recommend checking that the flow is not disturbed in the mesh. What I mean with this is that sometimes there might be a surprising blockade for instance a interface might actually be defined as wall or maybe some volumes in your mesh are not completely connected into each other.

June 30, 2016, 06:09	how can i solve this problem about divergence detected in AMG solver	#1
bjkim87 New Member Philip Kim Join Date: Jun 2016 Posts: 2 Rep Power: 0	hello my name is philip kim. i have some problems when i am trying to analysis fluid dynamics. TUI messages is "Divergence detected in AMG solver : pressure coreection -> Turning off correction scaling" i establish that model is k-e realizable, dynamic mesh was opened(transient solving), and solution method and controls, monitors are default values. i have tried to change model but it was same. how can i solve this problems? i will wait for your responses. thank you

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July 1, 2016, 05:02		#4
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	check : mesh, boundary conditions, scaling/units, solver settings

July 1, 2016, 07:03		#5
divergence Member Join Date: Mar 2014 Posts: 56 Rep Power: 12	Set your under-relaxation parameters to a lower level (especially momentum and turbulence). Also I would recommend checking that the flow is not disturbed in the mesh. What I mean with this is that sometimes there might be a surprising blockade for instance a interface might actually be defined as wall or maybe some volumes in your mesh are not completely connected into each other.