CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

vertical gas-liquid separator problem with the convergence

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   October 5, 2011, 20:26
Default 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
juliom is on a distinguished road
Send a message via Skype™ to juliom
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
File Type: txt Homogeneo_071.txt (75.1 KB, 14 views)
juliom is offline   Reply With Quote

Old   October 6, 2011, 07:09
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,945
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
This might have some tips:

http://www.cfd-online.com/Wiki/Ansys...gence_criteria
ghorrocks is offline   Reply With Quote

Old   October 6, 2011, 08:06
Default
  #3
Senior Member
 
Julio Mendez
Join Date: Apr 2009
Location: Greensboro, U.S.A
Posts: 108
Rep Power: 8
juliom is on a distinguished road
Send a message via Skype™ to juliom
Dear Glenn,
I think that my problem is on the boundaries Conditions!!
Have you worked on this sort of problems before????
yours faithfullly
JM
juliom is offline   Reply With Quote

Old   October 6, 2011, 18:16
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,945
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
No, but I have a reasonable amount of general multiphase experience.
ghorrocks is offline   Reply With Quote

Old   October 20, 2011, 20:58
Default
  #5
New Member
 
GDCG
Join Date: Oct 2011
Posts: 2
Rep Power: 0
omem84 is on a distinguished road
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.
omem84 is offline   Reply With Quote

Old   October 21, 2011, 07:45
Default
  #6
Senior Member
 
Julio Mendez
Join Date: Apr 2009
Location: Greensboro, U.S.A
Posts: 108
Rep Power: 8
juliom is on a distinguished road
Send a message via Skype™ to juliom
dear Omen84
I would appreciate your help on this!!
I look foward to contact you soon...
Greetings..
JM
juliom is offline   Reply With Quote

Old   October 22, 2011, 00:18
Default
  #7
New Member
 
GDCG
Join Date: Oct 2011
Posts: 2
Rep Power: 0
omem84 is on a distinguished road
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
omem84 is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
Force can not converge colopolo CFX 13 October 4, 2011 22:03
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
mass flow in is not equal to mass flow out saii CFX 2 September 18, 2009 08:07
Gas dissolution from liquid phase with CFX Roger Young CFX 2 May 6, 2008 07:37


All times are GMT -4. The time now is 14:54.