# vertical gas-liquid separator problem with the convergence

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October 5, 2011, 20:26
vertical gas-liquid separator problem with the convergence
#1
Senior Member

Julio Mendez
Join Date: Apr 2009
Location: Greensboro, U.S.A
Posts: 108
Rep Power: 8
Dear friends, I have worked very hard on my thesis, but I have had problem with the convergence.
The boundaries conditions are:
Inlet: bulk Velocities (volume fraction of each phase)
Gas outlet (upper): pressure 0 psi
Liquid outlet (down): 0.35 psi (hydrostatic)

The model I am using is inhomogenues, specifically the particle model.
I am using the gravity vector due to the fact that I am modelling the gravitational effect (densities difference)
K-E for turbulence...
My simulation starts running but after 25 iteration this message appears :A wall has been placed at portion(s) of an OUTLET |
| boundary condition (at 100.0% of the faces, 100.0% of the area) |
| to prevent fluid from flowing into the domain.

I know what it means, the problem is that I have done several things but the problems continues.
Who can HELP ME ...
Thanks before hand
Attached Files
 Homogeneo_071.txt (75.1 KB, 14 views)

 October 6, 2011, 07:09 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,945 Rep Power: 85 This might have some tips: http://www.cfd-online.com/Wiki/Ansys...gence_criteria

 October 6, 2011, 08:06 #3 Senior Member   Julio Mendez Join Date: Apr 2009 Location: Greensboro, U.S.A Posts: 108 Rep Power: 8 Dear Glenn, I think that my problem is on the boundaries Conditions!! Have you worked on this sort of problems before???? yours faithfullly JM

 October 6, 2011, 18:16 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,945 Rep Power: 85 No, but I have a reasonable amount of general multiphase experience.

 October 20, 2011, 20:58 #5 New Member   GDCG Join Date: Oct 2011 Posts: 2 Rep Power: 0 Hi. Why are you using CFX? I am working in an oil-gas horizontal separator in FLUENT using eulerian model. I am using 0 pressure in the gas outlet and the oil column pressure in the oil outlet. I am fixing the operating conditions of pressure and density equal to separation pressure and gas density. I going to add you in my contacts to chat about this. Regards.

 October 21, 2011, 07:45 #6 Senior Member   Julio Mendez Join Date: Apr 2009 Location: Greensboro, U.S.A Posts: 108 Rep Power: 8 dear Omen84 I would appreciate your help on this!! I look foward to contact you soon... Greetings.. JM

 October 22, 2011, 00:18 #7 New Member   GDCG Join Date: Oct 2011 Posts: 2 Rep Power: 0 JULIOM I am not an expert, but I think that we can help each other sharing criteria. I just started a month ago to build the model with the help of CFD "experts" from CAVENDISH Company. This is my email gdg_84@hotmail.com Regards

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