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

2D annular flow

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 29, 2004, 16:39
Default 2D annular flow
  #1
Sarita Simoes
Guest
 
Posts: n/a
I am trying to simulate a 2D concentric annular flow, running for axisymmetric, using periodic boundary conditions but I am having convergence problems. I tried to run without axisymetric but the results that I got were different than the calculated analytical solution. My question is, what is the best way to simulate this system? Using periodic boundary conditions, 2D (and this would be), axisymmetric, 3D?
  Reply With Quote

Old   June 29, 2004, 19:50
Default Re: 2D annular flow
  #2
Gustavo
Guest
 
Posts: n/a
I've ran a few periodic annular simulations without a problem. What kind of mesh are you using? Are you using a turbulence model? What fluid are you simulating and what are your periodic conditions? If you turn off the axisymmetry then you're simulating channel flow (rectangular), and that's why you are getting different results.
  Reply With Quote

Old   June 30, 2004, 12:15
Default Re: 2D annular flow
  #3
Sarita Simoes
Guest
 
Posts: n/a
In order to generate the mesh I've first meshed all the edges and then I generated the mesh face using Quad Elements and Map Type. I am running for laminar flow and I am using water for that. I am using mass flow rate as an input for the periodic boundary conditions. Thank you very much Gustavo.
  Reply With Quote

Old   June 30, 2004, 14:00
Default Re: 2D annular flow
  #4
Evan Rosenbaum
Guest
 
Posts: n/a
Remember that your axis of symmetry must be the X axis.
  Reply With Quote

Old   July 1, 2004, 18:21
Default Re: 2D annular flow
  #5
Gustavo
Guest
 
Posts: n/a
Just the same comment as Evan. I don't see why there should be a problem modelling it in 2D-axisymmetric, just make sure your mesh is all above the X-axis (which is the axis of symmetry, or r=0 from a cylindrical point of view). If you're having convergence problems you might want to change the relaxation factors, but I'm pretty sure the defaults should be ok. Also, if you just want to know the fully developed velocity profile, like I did, I was using at least 3 elements in the y direction. Hope this helps.
  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
Annular Flow liquid-liquid Anf893 FLUENT 0 May 3, 2011 17:58
Annular Flow in Pipes metro OpenFOAM Running, Solving & CFD 0 August 11, 2010 03:34
ANNULAR FLOW MODELLING İbrahim Utku Başyazıcı FLUENT 0 April 17, 2006 04:07
regarding flow analysis in annular combustion cham aryan FLUENT 0 March 1, 2006 23:55
gambit mesh generation for core annular flow anand FLUENT 0 November 17, 2005 03:33


All times are GMT -4. The time now is 06:39.