CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Help modelling a 2D open channel

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

LinkBack Thread Tools Display Modes
Old   February 11, 2011, 09:02
Default Help modelling a 2D open channel
Join Date: Jan 2011
Posts: 42
Rep Power: 8
egge24 is on a distinguished road

I'm new using fluent. I'm trying to model a 2D (top view) open channel flow, a water tank, with an actuator disk in the middle of the cross section, see Fig.-1, in order to evaluate de horizontal components of velocity. The tank is y=1.37m, x=5m, the actuator disk (with edge geometry) is y=0.1m.

I set up the model with the following boundary conditions for every edge:
  • Inlet: inlet velocity.
  • Outlet: pressure outlet.
  • Side walls: walls.
  • Actuator disk: porous jump. Porous medium thickness = 0.001m, pressure jump coef. = 0.5/m (I tried higher values but the results didn't change) and face permeability = default value 1e10mē.
  • The edges next to the actuator are set as interior.
The problem is that the result doesn't show any variations in the velocity components due to the interaction with the actuator disk, see Fig.-2.

Any suggestions?

Thank you!

Fig.-1 - Tank mesh, actuator disk in red.

Fig.-2 - Velocity magnitude results.
egge24 is offline   Reply With Quote

Old   February 11, 2011, 14:03
Senior Member
Amir's Avatar
Join Date: May 2009
Location: Montreal, QC
Posts: 739
Blog Entries: 1
Rep Power: 16
Amir is on a distinguished road
first, you have open channel flow and phase changes occur in normal direction(z).
2D modeling is acceptable if actuator locate near free surface I think.
second, setting outlet as outflow may work.
Amir is offline   Reply With Quote


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
Problem installing on Ubuntu 9.10 -> 'Cannot open : No such file or directory' mfiandor OpenFOAM Installation 2 January 25, 2010 10:50
Modelling open channel flow. gizeh FLUENT 0 October 12, 2009 06:20
VOF modelling open channel river flow Matthew Roberts FLUENT 6 July 31, 2009 12:52
VOF modelling Open Channel flow Rodi FLUENT 2 August 11, 2007 13:15
Problem with VOF open channel modelling Biswanath Mahato FLUENT 1 September 14, 2006 04:20

All times are GMT -4. The time now is 11:25.