CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Big particle interation with fluid in DPM

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

LinkBack Thread Tools Search this Thread Display Modes
Old   January 14, 2001, 00:09
Default Big particle interation with fluid in DPM
Posts: n/a
I use Discrete Phase Model simulate solid and liquid flow in 3D bend . My tube diameter is 5 cm . and my particle diameter is 1cm . My particle load is big ,I expect fluid field will be changed becase of particles. But I found fluid is effectd by particle is small. I use interation with continuous phase and set 50. I set under-relation factors=0.1,or 0.01 or 0.001 I want to get good stable result . But result is not stable , Particle escape time is not the same when set different under-relation factors amd different frequency in interation with fluid . Residual plot is fluctuant. if anyone have some experience do this job? Can anyone help me? Thanks!
  Reply With Quote

Old   January 15, 2001, 04:32
Default Re: Big particle interation with fluid in DPM
Posts: n/a
Hi olivia,

I think that your case is a little bit out of the valid use of a DPM models : this kind of model is basing on the particle Source in Cell model which is only suitable for small particles and a small load (ie <10% in volume). I think thats why you obtain some strange results. Nevertheless you shouldn't use such small under relaxation factors because it will weak the coupling of your Lagrangian equations with eulerian phase so it is normal that it will have an influence on the solution.

You should look for another approach such Eulerian granular model or try to write your own code.
  Reply With Quote


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
how to see the time that the particle stays in the fluid region of the cfx-post? dada1204 CFX 3 November 13, 2010 11:09
About Particle velocity of DPM in Fluent? long zhengwei FLUENT 0 March 13, 2009 04:02
Particle mass flow rate Jeff CFX 3 September 17, 2004 10:46
particle velocity in DPM David FLUENT 3 April 28, 2003 19:46
What is best way to simulate big particle yueroo FLUENT 2 April 13, 2001 21:28

All times are GMT -4. The time now is 06:01.