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

Media with low porosity

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 29, 2006, 12:44
Default Media with low porosity
  #1
Emmanuel Resch
Guest
 
Posts: n/a
Hi,

I have a situation where the flow runs through an annulus channel, where the outer boundary is a wall and the inner boundary is a solid medium with porosity ~30%. This medium is followed by another layer of even lower porosity. In reality, mass diffuses through these two porous media, and convective transport is ~ zero. If I were to use the "Porosity" tab in Star GUIde to model these porous cells, I calculate extremely high values for alpha and beta constants. (e.g. my lowest values are alpha=9.618e+04 and beta=5840.1)

After running a simulation, the results show effectively no mass flow in the inner (porous) media.

I guess I am having trouble with the diffusion part of this process... Does anyone have experience with this? Where can I make adjustments to account for the diffusion process?

Thanks, Emmanuel
  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
Free media&porous media.Big changes in properties. Isi Main CFD Forum 1 July 14, 2008 07:18
porosity Riccardo FLUENT 0 May 25, 2007 04:45
porous media with variable porosity Kevin A. FLUENT 3 December 24, 2006 11:56
Porosity Jan CFX 3 April 1, 2003 19:00
Help on porosity Leon Mills Phoenics 1 June 18, 2002 08:59


All times are GMT -4. The time now is 06:55.