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

transport equation

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 7, 2004, 09:49
Default transport equation
  #1
CMB
Guest
 
Posts: n/a
Hi, I am trying to model an electrochemical device with v3.15. In order to achieve a conservation of charge I have to define a different continuity equation for the potential distribution inside a solid region (i.e. domain of solid cells). The potential does not follow traditional d/dxi (roi ui) = 0 but (d/dxi)^2 (poti) = 0, (i being the x,y,z, ro density, u being u,v,w and pot the potential) this is Laplace's equation. Is it possible to apply this in Star?, As far as I am concerned sormom.f allows you to modify the momentum equation but what about the continuity equation for conduction in a solid block? Would appreciate any suggestions. Many thanks, CMB
  Reply With Quote

Old   July 8, 2004, 03:36
Default Re: transport equation
  #2
Richard
Guest
 
Posts: n/a
You can only solve for temperature in solid materials. I presume you are modelling your solids using a fluid material but with momentum deactivated? I think that's what you'd need to do. Then, you can model your potential as a passive scalar and choose "diffusion" as the solution method for it. This will deactivate the convection term completely (although you will already have zero velocity through having deactivated momentum, so it might not make much difference).
  Reply With Quote

Old   July 9, 2004, 05:19
Default Re: transport equation
  #3
CMB
Guest
 
Posts: n/a
Yes, I see what you mean. It will not make much difference. But how about setting my solid region as a porous one, with a very very low permeability?, that way I can still keep momentum activated and as you say solving for diffusion in this particular scalar?, I think I will do this. Best Regards, CMB
  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
Species transport equation Bunmi FLUENT 1 December 3, 2013 16:39
UDF for concentration transport equation heri FLUENT 1 August 15, 2011 11:23
Poisson equation combined with transport equation Se-Hee CFX 0 December 27, 2007 02:00
transport equation Arman Main CFD Forum 1 August 28, 2007 12:48
Transport equation using UDF wassim FLUENT 5 February 14, 2007 23:56


All times are GMT -4. The time now is 14:03.