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

How to fix an outlet flow rate ?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 23, 2004, 10:32
Default How to fix an outlet flow rate ?
  #1
242VDM242
Guest
 
Posts: n/a
Hi !

I want to simulate a simple case of a tank containing air and water. The water level stays constant over time and I have an inlet of water+air, an outlet of water and an oulet of air. To conserve my level of water I want to fix the outlet of water : How can I do, there are no velocity outlet boudary conditons ?

I tried to set a velocity inlet at the water exit and by UDF set a negative value to the adjacent cells and extrapolate the velocity field to the boundary but I have a segmentation violation...

Any suggestions ?

Thanks
  Reply With Quote

Old   November 23, 2004, 10:52
Default Re: How to fix an outlet flow rate ?
  #2
Jason
Guest
 
Posts: n/a
You can define the velocity direction without using a UDF. Change the velocity specification method from "Magnitude, Normal to Boundary" to "Magnitude and Direction" or "Components. Then just define the direction of the flow so it is leaving your system.

Hope this helps.

Good luck Jason
  Reply With Quote

Old   November 24, 2004, 09:48
Default Re: How to fix an outlet flow rate ?
  #3
242VDM242
Guest
 
Posts: n/a
This works only in single phase configuration. When in multiphase, fixing this kind of boundary conditions leads to a segmentation violation errors at the initialization of the variables.
  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
Problems in pressure when using mass flow rate outlet rafiktharwat CFX 11 January 2, 2014 18:21
ATTENTION! Reliability problems in CFX 5.7 Joseph CFX 14 April 20, 2010 15:45
particle, parcel and mass flow rate balance flybird FLUENT 0 May 24, 2007 10:44
Modeling reduced flow rate in 2D Tom Smith FLUENT 2 April 27, 2007 09:04
targeted mass flow rate at outlet in axisym case Leon FLUENT 1 February 10, 2005 11:15


All times are GMT -4. The time now is 19:47.