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

Particle Deposition and Interception

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 16, 2015, 09:53
Default Particle Deposition and Interception
  #1
New Member
 
Join Date: Oct 2014
Posts: 24
Rep Power: 12
abcdefgh is on a distinguished road
Hey Guys,

I try to simulate a filter process with Ansys CFX and Fluent (I try I in both Programs). The Filter Medium is a complex Geometry.

Deposition Mechanism are Inertia (I can realize it with the Particle mass), gravitation (with buoancy), diffusion and interception. And here are the problems:

Is there any way to modell diffusion? It brownsion diffusion, a random motion of very small particles. In Matlab I could realize it with sign(randn), a random number. Is in CFX or Fluent an possibilty to consider this?

The next problem is the interception. Thats the mechism that particle hits the filterwall because of the volume of the Particle (not only a mass point). I've read that I could do it with an UDF particle termination - but for that the filter has to be a sphere/the filter must be uniform, that for example you can assign a radius. But thats not possible here. Unfortunately, the geometry is too complex. Is there another way? For example, that I generally refer it to the defined boundary condition (filter wall). I hope you know what I mean.

Many thanks for the help.
abcdefgh is offline   Reply With Quote

Old   August 31, 2018, 07:39
Default
  #2
New Member
 
surya
Join Date: Jul 2015
Posts: 24
Rep Power: 11
surya.tdr is on a distinguished road
Quote:
Originally Posted by abcdefgh View Post
Hey Guys,

I try to simulate a filter process with Ansys CFX and Fluent (I try I in both Programs). The Filter Medium is a complex Geometry.

Deposition Mechanism are Inertia (I can realize it with the Particle mass), gravitation (with buoancy), diffusion and interception. And here are the problems:

Is there any way to modell diffusion? It brownsion diffusion, a random motion of very small particles. In Matlab I could realize it with sign(randn), a random number. Is in CFX or Fluent an possibilty to consider this?

The next problem is the interception. Thats the mechism that particle hits the filterwall because of the volume of the Particle (not only a mass point). I've read that I could do it with an UDF particle termination - but for that the filter has to be a sphere/the filter must be uniform, that for example you can assign a radius. But thats not possible here. Unfortunately, the geometry is too complex. Is there another way? For example, that I generally refer it to the defined boundary condition (filter wall). I hope you know what I mean.

Many thanks for the help.

I am trying to simulate similar problem. Can anyone help me to write a udf for particle deposition by interception on a fiber...
surya.tdr is offline   Reply With Quote

Old   October 6, 2024, 06:46
Default
  #3
New Member
 
Ika Yuni Rachmawati
Join Date: Aug 2024
Posts: 1
Rep Power: 0
ikayr is on a distinguished road
I have the same problem here. Has it been solved?
ikayr is offline   Reply With Quote

Reply


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 Deposition, Diffusion, Interception abcdefgh Main CFD Forum 2 November 16, 2018 01:26
Particle Deposition in Granular Beds (Tracking) Tantal CFX 11 January 27, 2014 18:01


All times are GMT -4. The time now is 21:02.