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

Particle Tracking - Expression for Coefficient of Restitution

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

Like Tree2Likes
  • 2 Post By ghorrocks

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 2, 2024, 05:58
Default Particle Tracking - Expression for Coefficient of Restitution
  #1
New Member
 
Join Date: Jun 2022
Posts: 2
Rep Power: 0
PatLe is on a distinguished road
Hello together,

I'm doing a particle tracking in a turbo machinery and I'm mostly interested in the particle behavior at the blades. I'm assuming, that the particles bounce of the walls, so I set a value for the perpendicular and parallel coefficient of restitution. In experiments at my university we saw, that it is to easy to assume a constant value for the coefficients of restitution. So my idea is to create an expression, which depends on the particle velocity directly before the impact and the wall impact angle of the particle.
-> Perpendicular CoR = f(Particle.Velocity, Wall Impact Angle)
-> Parallel CoR = f(Particle.Velocity, Wall Impact Angle)

I already tried to implement the expressions, but there were some problems.

The particle velocity is a non-scalar variable, which is not allowed to put in the coefficient of restitution. I also tried to create my own velocity variable ( -> Particle.Vel = sqrt(Particle.Velocity u^2 + Particle.Velocity v^2 + Particle.Velocity w^2) ) but there is another error message, that this is a field valued variable and the coefficient of restitution only allows single valued parameters.
Do you know how to fix that problem?

Another problem is, that I don't find a variable for the wall impact angle, that I can call in the expression. Do you know, if there is a variable I can call?


I already read in other threads, that this should be possible, but I never saw an solution that worked.


Thank you very much for your help!
PatLe is offline   Reply With Quote

Old   February 2, 2024, 18:21
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,727
Rep Power: 143
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
I don't think you can do this in CEL. I think you will need to do it with user fortran. Have a look in the documentation for the user fortran routines for particle tracking.
Opaque and PatLe like this.
__________________
Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.
ghorrocks is offline   Reply With Quote

Reply

Tags
particle tracking

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Particle tracking file per time step in an Unsteady Particle Tracking Manu4CFD FLUENT 1 December 29, 2022 07:15
Particle tracking prob, urgent. sakurabogoda CFX 1 March 11, 2013 21:11
How to install CGNS under windows xp? lzgwhy Main CFD Forum 1 January 11, 2011 18:44
CGNS lib and Fortran compiler manaliac Main CFD Forum 2 November 29, 2010 06:25
restarting lagrange (particle tracking) simulation dbdias CFX 0 September 22, 2007 19:26


All times are GMT -4. The time now is 20:57.