CFD Online Logo CFD Online URL
Home > Forums > FLUENT

variable diffusivity

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

LinkBack Thread Tools Display Modes
Old   May 1, 2005, 15:04
Default variable diffusivity
Posts: n/a
I am solving gas diffusion equation using fluent 6.1. I have a porous media and fluid domain next to each other. There is no force convection and velocities are mainly due to diffusive forces in the model. I am using mixture template to model species transport. I want to turn off flow equations to get quick results, but doing that will make the momentum sink terms in porous media model go to zero when flow equations are not solved. To still get the resistance to diffusion in the porous medium, I will like to mass diffusion coeff in the porous medium as compared to the fluid medium. How do I do that. How do I make the mixture template use one value of mass diffusivity in one domain and a different value of mass diffusivity in a different domain. The values wont change with time. Do I need a UDF to do this? Please guide. Thanks in advance.
  Reply With Quote


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
emag beta feature: charge density charlotte CFX 4 March 22, 2011 10:14
error in COMSOL:'ERROR:6164 Duplicate Variable' bhushas Main CFD Forum 1 May 30, 2008 04:35
Additional Variable - Diffusive Transport Equation RadheShyam Das CFX 3 October 18, 2007 12:35
Env variable not set gruber2 OpenFOAM Installation 5 December 30, 2005 05:27
Replace periodic by inlet-outlet pair lego CFX 3 November 5, 2002 21:09

All times are GMT -4. The time now is 02:41.