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

some problems about particle track

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 3, 2015, 04:24
Default some problems about particle track
  #1
New Member
 
andy
Join Date: Dec 2015
Posts: 9
Rep Power: 3
suplee is on a distinguished road
Hi,
I am doing a simulation about particle separation in a flow channel. When the solution is done, the CFD-POST was used to show the streamline and particle track.
So the problems comes, the streamline travel in the flow channel without any disturb while the particle track disappeared in the 1/5 of the flow channel.
I want to use CFD-POST show the particle separation in the flow channel, so the particle track should be into the inlet and out of the outlet without any break off.
Is there any better way to solve this problem?
I need your help,help!!!
Thank you !
suplee is offline   Reply With Quote

Old   December 3, 2015, 06:14
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 12,832
Rep Power: 100
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
Are you sure the particle tracks do in fact go out the outlet?

Please post an image of what you are getting and what you expect to get.
ghorrocks is online now   Reply With Quote

Old   December 3, 2015, 22:23
Default
  #3
New Member
 
andy
Join Date: Dec 2015
Posts: 9
Rep Power: 3
suplee is on a distinguished road
Thanks for your reply very much.
yes,I am sure that the particle should go out the outlet,but it stopped on the halfway.
And I don't know how to upload image to forum,so what I do is just explain it to you.
Quote:
Originally Posted by ghorrocks View Post
Are you sure the particle tracks do in fact go out the outlet?

Please post an image of what you are getting and what you expect to get.
suplee is offline   Reply With Quote

Old   December 4, 2015, 05:39
Default
  #4
New Member
 
andy
Join Date: Dec 2015
Posts: 9
Rep Power: 3
suplee is on a distinguished road
http://pan.baidu.com/s/1pKpyNrH
The image was showed in the website above.The left side was the outlet and the red line was the particle track result for particles.I want those particles go out of the outlet but they stopped as the image showed.
And I hope for your help very much,thank you.
Quote:
Originally Posted by ghorrocks View Post
Are you sure the particle tracks do in fact go out the outlet?

Please post an image of what you are getting and what you expect to get.
suplee is offline   Reply With Quote

Old   December 7, 2015, 05:51
Default
  #5
New Member
 
andy
Join Date: Dec 2015
Posts: 9
Rep Power: 3
suplee is on a distinguished road
ghorrocks,I need your help.
If you see my reply,please help me to solve the problem I met.
Thank you very much.
Quote:
Originally Posted by ghorrocks View Post
Are you sure the particle tracks do in fact go out the outlet?

Please post an image of what you are getting and what you expect to get.
suplee is offline   Reply With Quote

Old   December 7, 2015, 06:26
Default
  #6
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 12,832
Rep Power: 100
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
Please post images directly into the forum in future. Many computers cannot open links on web pages like baidu.com.

The first thing to do is to convince yourself that the particle tracks actually go to the exit. Have a look at your output file and see what the particle fates are.

The check the rendering options on CFD-Post. I do not do much particle tracking stuff so cannot tell you exactly which options to look at, but see if it is down sampling the tracks or doing some other simplification option.
ghorrocks is online now   Reply With Quote

Old   December 7, 2015, 23:43
Default
  #7
New Member
 
andy
Join Date: Dec 2015
Posts: 9
Rep Power: 3
suplee is on a distinguished road
Thanks for your reply.
I exported the results which reflects the particle velocity VS its geometry coordinate. By checking these datas, I find the particle stopped at the same position.
So do you have any ideas about the reason of the problem and its solution?
Hope for your reply.
Quote:
Originally Posted by ghorrocks View Post
Please post images directly into the forum in future. Many computers cannot open links on web pages like baidu.com.

The first thing to do is to convince yourself that the particle tracks actually go to the exit. Have a look at your output file and see what the particle fates are.

The check the rendering options on CFD-Post. I do not do much particle tracking stuff so cannot tell you exactly which options to look at, but see if it is down sampling the tracks or doing some other simplification option.
suplee is offline   Reply With Quote

Old   December 7, 2015, 23:52
Default
  #8
New Member
 
andy
Join Date: Dec 2015
Posts: 9
Rep Power: 3
suplee is on a distinguished road
Quote:
Originally Posted by ghorrocks View Post
Please post images directly into the forum in future. Many computers cannot open links on web pages like baidu.com.

The first thing to do is to convince yourself that the particle tracks actually go to the exit. Have a look at your output file and see what the particle fates are.

The check the rendering options on CFD-Post. I do not do much particle tracking stuff so cannot tell you exactly which options to look at, but see if it is down sampling the tracks or doing some other simplification option.
suplee is offline   Reply With Quote

Old   December 8, 2015, 00:25
Default
  #9
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 12,832
Rep Power: 100
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
Quote:
The first thing to do is to convince yourself that the particle tracks actually go to the exit. Have a look at your output file and see what the particle fates are.
So it looks like the particle tracks do no go to the exit - the quote says what to do next....
ghorrocks is online now   Reply With Quote

Old   December 8, 2015, 01:17
Default
  #10
New Member
 
andy
Join Date: Dec 2015
Posts: 9
Rep Power: 3
suplee is on a distinguished road
Oh, there's one error when I edit the cfd-post after the solution was done.Are there any links between this error and my problem?
Quote:
Originally Posted by ghorrocks View Post
So it looks like the particle tracks do no go to the exit - the quote says what to do next....
suplee is offline   Reply With Quote

Old   December 8, 2015, 01:22
Default
  #11
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 12,832
Rep Power: 100
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
Possibly. It means you have not defined a location parameter in one of the objects in CFD-Post.
ghorrocks is online now   Reply With Quote

Old   December 8, 2015, 01:28
Default
  #12
New Member
 
andy
Join Date: Dec 2015
Posts: 9
Rep Power: 3
suplee is on a distinguished road
So it means that I should check the cfd-pre to find out the reason or any other means?
Quote:
Originally Posted by ghorrocks View Post
Possibly. It means you have not defined a location parameter in one of the objects in CFD-Post.
suplee is offline   Reply With Quote

Old   December 8, 2015, 01:45
Default
  #13
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 12,832
Rep Power: 100
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
No, the problem is post processing. Something in CFD-Post is wrong.
ghorrocks is online now   Reply With Quote

Old   December 8, 2015, 01:54
Default
  #14
New Member
 
andy
Join Date: Dec 2015
Posts: 9
Rep Power: 3
suplee is on a distinguished road
Thank you for your reply.
So of which part may be wrong and how to deal with it?
Quote:
Originally Posted by ghorrocks View Post
No, the problem is post processing. Something in CFD-Post is wrong.
suplee is offline   Reply With Quote

Reply

Tags
particle track

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
Particle Track in CFX Jmac CFX 9 July 10, 2014 07:42
In DPM model, with rosin-rammler particle size distribution described problems, thank fa84a8g779 FLUENT 1 July 11, 2013 21:30
Laminar Flow and Particle Track: Inconsistent? Domenico FLUENT 0 February 20, 2007 15:47
Particle Track Domenico FLUENT 2 February 19, 2007 19:56
Particle track James Bewley CFX 0 April 28, 2006 06:04


All times are GMT -4. The time now is 17:41.