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

Species diffusion coefficient

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 7, 2004, 22:06
Default Species diffusion coefficient
  #1
iceabc
Guest
 
Posts: n/a
I defined species mass diffusion coefficient by dilute approximation and then i want to use diffusion coefficient at some UDF. I found there is a macro "C_DIFF_L(c,t,i,j)" used for diffusion coefficient in FLUENT. I know "i" and "j" meaning. However, the diffusion coefficient defined by dilute approximation is based on species "i" diffusion at mixture and not based on that species "i" diffuse in species "j". So how to use this macro to obtain the species diffusion coefficient defined by dilute approximation and how to set "i,j" at this macro? Thanks.
  Reply With Quote

Old   June 10, 2004, 11:04
Default Re: Species diffusion coefficient
  #2
D Harvey
Guest
 
Posts: n/a
There is a post on the fluent website on how to specify your own diffusivity model. In it you are shown how to calculate j1,j2 for a binary model from the value of i that is passed in the define diffusivity macro. The dilute model is species i diffusing into background species not each individual species. The C_DIFF_L(c,t,i,j) is a binary value and is used to form D[i[m]]. Check out the fluent site and see if that can't give you any ideas.

DH
  Reply With Quote

Reply

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
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 07:20
binary diffusion coefficient / kevin FLUENT 3 July 1, 2012 14:07
Questions on Species Mass diffusion coefficient Eddy FLUENT 1 March 11, 2008 12:06
Who ever wrote the mass diffusion coefficient ?? kevin FLUENT 0 April 30, 2002 10:37
Who can write the binary diffusion coefficient ?? Hsin-Ping FLUENT 1 April 15, 2002 03:22


All times are GMT -4. The time now is 07:04.