CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

particle tracking needs YOU!

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 18, 2013, 05:50
Default particle tracking needs YOU!
  #1
Member
 
ziehjay
Join Date: Jul 2013
Posts: 43
Rep Power: 4
sanjar is on a distinguished road
Hey guys, i m happy that i found this forum for openfoam. i hope that i find some advice or even a somebody with good OF skills for around 15 minutes for my OF case.
shortly what it is about:
i want to create a particle tracking case with the euler langrage method.

For this i created two sub-cases;
one with the fluid and the other one with the particles.
the following describes what i did:

1) solved the fluid case with simpleFoam,

2) coupled it with the case of the particle with "mapFields ..(case-fluid)/(case-particle)

3) opened the particle case, solved it with icoUncoupledKinematicParcelFoam

4) foamToVTK

5) paraFoam

6) here is the problem: i do not see any particles. i clicked "next frame" as long as i could but there was no langragian field at all.. ;(

i wonder why it doesnt work.
the case with the fluid seems to be correct.

If there is somebody who did that already, just a particle tracking case, it would be fantastic to help me!

Thank you in advance!

Just answer here in this thread or a pm!

Sanjar
sanjar is offline   Reply With Quote

Old   July 18, 2013, 17:07
Default
  #2
New Member
 
Thomas F.
Join Date: Jun 2013
Location: Graz, Austria
Posts: 14
Rep Power: 4
Dommy is on a distinguished road
Doing the same at the moment! Lets share because I have some serious issues with my case!

For your post processing read this http://openfoamwiki.net/index.php/Ma...gian_particles

A different way (which is more disk space saving) is to use Paraview right after reconstucting - or even before!

(Reconstruct) - Paraview - reconstucted case - turn on lagrangian/kinematiccloud - of course there are no particles at time step 0! -> hopefully see your parcels..

You may find this useful as well http://openfoamwiki.net/index.php/Tu..._based_methods

If this doesn't help - share your case - I will have a look!


Question back - have you looked into Dispersion models?

Best,
Thomas
Dommy is offline   Reply With Quote

Old   July 20, 2013, 05:31
Default
  #3
Member
 
ziehjay
Join Date: Jul 2013
Posts: 43
Rep Power: 4
sanjar is on a distinguished road
hey thomas,

here are the cases. as i described i split them into two subcases.
i didnt pack the mesh-data in it, but it is in both cases included.

Best regards!
Attached Files
File Type: zip CASE FLUID.zip (13.5 KB, 8 views)
sanjar is offline   Reply With Quote

Old   July 20, 2013, 05:36
Default
  #4
Member
 
ziehjay
Join Date: Jul 2013
Posts: 43
Rep Power: 4
sanjar is on a distinguished road
case with particles
Attached Files
File Type: zip system.zip (3.9 KB, 9 views)
File Type: zip constant.zip (7.2 KB, 7 views)
sanjar is offline   Reply With Quote

Old   July 20, 2013, 05:43
Default
  #5
Member
 
ziehjay
Join Date: Jul 2013
Posts: 43
Rep Power: 4
sanjar is on a distinguished road
0-file for particle

hope you guys can see what is (are) my mistake(s)
Attached Files
File Type: zip 0.zip (2.8 KB, 8 views)
sanjar is offline   Reply With Quote

Old   July 20, 2013, 16:57
Default
  #6
New Member
 
Thomas F.
Join Date: Jun 2013
Location: Graz, Austria
Posts: 14
Rep Power: 4
Dommy is on a distinguished road
I cant see a real mistake - just some ideas.

You should refine your time step in the particle case. At the moment you are calculating the position of your particle cloud every second which might not be sufficient if your fluid flows with 5 m/s. I dont know the size of your mesh but if the particles reach 5 m/s they travel 5 meters before you track them again - try something much smaller.

Second idea: refine your writing interval - you are only able to see changes in the field every 10 seconds - with this flow speed that cant be sufficient

How big is your mesh? Any chance to attach it? I started with Euler - Lagrange 2 months ago and I want to see as many cases as I can

Best,
Thomas
Dommy is offline   Reply With Quote

Old   September 4, 2013, 13:16
Default
  #7
Member
 
India
Join Date: Oct 2012
Posts: 84
Rep Power: 4
mayank.dce2k7 is on a distinguished road
Hi Sanjar,

I see you are working with icoUncoupledKinematicParcelFoam. Do you know how to give initial particle velocity equal to fluid velocity. My fluid velocity field at inlet varies with space(i.e parabolic)? I need the particle to follow same profile?

Regards,
Mayank
mayank.dce2k7 is offline   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
dispersion model with lagragian particle tracking model for incompressible flows eelcovv OpenFOAM Running, Solving & CFD 48 January 31, 2015 11:10
Ubuntu 12.10 + openfoam2.2.0 ==> paraview error message peteryuan OpenFOAM Installation 6 August 18, 2013 18:00
Particle tracking prob, urgent. sakurabogoda CFX 1 March 11, 2013 22:11
Blood Damage Modelling via Particle Tracking in a Centrifugal Heart Pump scatman CFX 5 May 5, 2011 07:23
Particle Tracking for ion Jun CFX 2 August 31, 2010 08:19


All times are GMT -4. The time now is 12:24.