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

determination of jet front

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 8, 2007, 14:13
Default determination of jet front
  #1
Fred
Guest
 
Posts: n/a
I am simulating one liquid injecting into another liquid in a tank and trying to determine the transient jet front and shape. I noticed there are different jet length when I use different values of volume fraction in the jet contour plot. Same thing happens while using different jet velocities for determining the jet boundary. This led me to think about the criteria for determining the jet shape in previous jet experiments. How to match the test data with CFD?

Thanks!
  Reply With Quote

Old   February 8, 2007, 14:30
Default Re: determination of jet front
  #2
Joe
Guest
 
Posts: n/a
Well, how does your test data determine it?

  Reply With Quote

Old   February 8, 2007, 15:10
Default Re: determination of jet front
  #3
Fred
Guest
 
Posts: n/a
I am using previous test results, in which they used a high-speed camera to visualize the dyed jet with color. Obviously, the color will disappear as the concentration of dye or dyed liquid decreases. In CFD, I modeled the injection as dispersed fluid and process the results using the volume fraction of the injection fluid. Thanks!
  Reply With Quote

Old   February 8, 2007, 16:43
Default Re: determination of jet front
  #4
Joe
Guest
 
Posts: n/a
Dispersed fluid!? Thats your problem right there.

Use a single phase flow with a non-diffusing scalar to tag the jet flow.
  Reply With Quote

Old   February 11, 2007, 11:09
Default Re: determination of jet front
  #5
Fred
Guest
 
Posts: n/a
Thanks Joe.

I tried the scalar approach before and the transient jet length I got is much less than experimental data, almost half of the measured jet length. Then I switched to dispersed fluid approach. Do you have any suggestions what parameters in the scalar approach I can adjust to increase the predicted jet length to match the test data.

Thank you so much for help!
  Reply With Quote

Old   February 11, 2007, 13:01
Default Re: determination of jet front
  #6
Joe
Guest
 
Posts: n/a
How about you provide proper information such as fluid type, Reynolds number, meshes, ... Then you can get meaningfull input.

  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
2D Plane Jet Fluent Solution doug Main CFD Forum 10 October 16, 2013 00:47
Jet fan and Tunnel simulation ahlo7 CFX 7 March 7, 2012 11:25
method to determine jet front Fred Main CFD Forum 0 February 8, 2007 14:15
Front tracking Don Hawken Main CFD Forum 1 December 12, 1999 14:29
IMPINGING JET ........... HELP!!!!!!!! Amir Omoumi Main CFD Forum 10 August 30, 1999 22:11


All times are GMT -4. The time now is 20:55.