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

Problem of simulating shape oscillations of Bubble - Multiphase flow

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 25, 2013, 06:45
Default Problem of simulating shape oscillations of Bubble - Multiphase flow
  #1
New Member
 
Akash
Join Date: Jan 2013
Location: India
Posts: 20
Rep Power: 4
akash is on a distinguished road
Hello,
I'm a novice to Fluent. I'm trying to simulate 2D shape oscillations of an air bubble in an incompressible fluid, say water. I had prepared the grid in Pointwise.
I had to define a single domain as I needed to work with structured grid. But when I import the grid in Fluent, the bubble-fluid interface is not detected. Even then I tried using the multiphase option, defined two different fluids. I'm not able to define the phases and appropriate BCs.

How can I explicitly define two different domains in fluent and set the fluid properties respectively. In simple words how will I make Fluent understand which fluid (air and water) is to be used in particular regions.

Also the initial shape of the bubble is complex. It isn't a conic. Please have look at the grid with the attached url. http://imgur.com/0lFY5jD

Last edited by akash; January 25, 2013 at 06:47. Reason: url attached wasn't shown
akash is offline   Reply With Quote

Old   January 26, 2013, 00:51
Default
  #2
Senior Member
 
SSL
Join Date: Oct 2012
Posts: 227
Rep Power: 5
msaeedsadeghi is on a distinguished road
I have done that. As I have understanded, your problem is an enclosure with two phases (air and water). At the initialization you should set the volume fraction of each phase at each cell. It is possible with a UDF. Also you can do it if define a zone in gambit to set it for example as air in fluent.
msaeedsadeghi is offline   Reply With Quote

Old   January 29, 2013, 14:46
Default
  #3
New Member
 
Akash
Join Date: Jan 2013
Location: India
Posts: 20
Rep Power: 4
akash is on a distinguished road
Sir,
I want to mesh it as shown in the attached figure in the previous post . The problem in defining zones in Gambit is that I have to first create two separate faces to define 2 zones. But I don't want to separately mesh the interior region. I tried to split the mesh along the nodes on the on the interface, but I got some error messages.
Basically what I want is when I import the grid in Fluent, it should identify two different regions and also identify the interface boundary between them.
Please let me know on how can I split the mesh along a given edge in gambit and define it as an interface.
akash is offline   Reply With Quote

Reply

Tags
multiphase model, oscillating bubble

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
Boundary condition problem for open channel flow Andy CFX 8 October 1, 2012 07:45
Fluids list in multiphase flow problem Piti CFX 1 February 4, 2009 10:33
problem with multiphase flow sri FLUENT 4 July 24, 2007 06:56
problem simulating flow around a building xavier FLUENT 5 January 3, 2007 06:16
Multiphase flow modeling Paul CFX 2 August 11, 2003 09:41


All times are GMT -4. The time now is 13:43.