CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

inlet conditions for multiphase problems

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 12, 2011, 06:40
Default inlet conditions for multiphase problems
  #1
New Member
 
Join Date: Jul 2011
Posts: 19
Rep Power: 6
of_user_ is on a distinguished road
hi. i do have problems in a case concerning the inlet in a multiphase problem.

in my case, i have a droplet of phase2 sitting on a surface. on this surface i have a smaller patch with an inlet BC to inject more fluid of phase2 into the droplet. i simply edited the files 'alpha1' and 'U' this way:

Quote:
bottomInlet
{
type constantAlphaContactAngle;
theta0 105;
limit gradient;
value uniform 1;
}
Quote:
bottomInlet
{
type fixedValue;
value uniform (0 0 0.005);
}
and this works perfectly for a certain amount of time. but when the droplet is getting really large, the inlet is not inserting pure phase2 fluid anymore but a mixture of phase 1 and 2 instead.

does anybody know how to force the inlet to inject phase2 during the hole simulation time?

thank your for your help!

regards...



/edit:
it seems like this problem is just appearing for constantAlphaContactAngle. with dynamicAlphaContactAngle i do not have this phenomena.

Last edited by of_user_; July 12, 2011 at 08:33.
of_user_ is offline   Reply With Quote

Old   July 13, 2011, 04:06
Default inlet conditions for multiphase problems
  #2
ata
Senior Member
 
ata's Avatar
 
ata kamyabi
Join Date: Aug 2009
Location: Kerman
Posts: 322
Rep Power: 8
ata is on a distinguished road
Hi
Use constant pressure at the inlet instead of constant velocity.
ata is offline   Reply With Quote

Old   July 13, 2011, 04:32
Default
  #3
New Member
 
Join Date: Jul 2011
Posts: 19
Rep Power: 6
of_user_ is on a distinguished road
i will try that, thank you so far!
of_user_ 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
Changing inlet conditions without starting again Conflate OpenFOAM Pre-Processing 2 April 1, 2011 07:29
Boundary conditions: inlet and outlet aline OpenFOAM 7 June 29, 2010 03:45
periodic boundary conditions at the inlet Nacho Tauste FLUENT 0 January 14, 2009 13:34
inlet boundary conditions species transport richard FLUENT 2 August 20, 2008 07:25
Problems with Inlet species San24 CD-adapco 1 May 7, 2008 06:29


All times are GMT -4. The time now is 14:04.