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

time dependent B.C

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   November 11, 2003, 13:25
Default time dependent B.C
  #1
co2
Guest
 
Posts: n/a
Dear Fluent users,

Please help me out with the following question -

In my model, I have a wall with heat flux B.C. Now I need to change the heat flux value every minute - thus making it a time varying B.C. But I have no idea as to how to do it - I know it has something to do with profile writing etc. But I have not found a fluent tutorial that can tell me how to do it - The help files discuss this topic but I have not been able to really do anything with it. Can someone provide me some example of the profile file, a tutorial etc, may be some other website..

Thank you and looking forward to a helpful reply from someone.
  Reply With Quote

Old   November 18, 2003, 21:59
Default Re: time dependent B.C
  #2
Alamgir
Guest
 
Posts: n/a
it should be like velocity profile UDF. only u need to replace velocity with heat flux, (before proceding just get information what fluent macro is for heat flux). then call udf whr u put the value of heat flux.

if it is not enough just write to me, I may help u in this regard.

Alamgir
  Reply With Quote

Old   November 18, 2003, 22:01
Default Re: time dependent B.C
  #3
Alamgir
Guest
 
Posts: n/a
It should be like usteady velocity profile UDF
  Reply With Quote

Old   November 26, 2003, 16:55
Default Re: time dependent B.C
  #4
co2
Guest
 
Posts: n/a
Alamgir,

thanks for your note. i was able to change the temperature of the wall using a function definition just the way they had shown in manual for transient velocity. but how to do the same with heat flux.

I actually have a formula for calculation of this heat flux and it depends on the revolution of sun around the object. the formula also requires some other complicated angles etc. let us say i do these calculations seperately in a excel spreadsheet and get the heat flux values for each minute of different walls. how do i feed these calculated values to the udf for heat flux of a particular wall?
  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
Extrusion with OpenFoam problem No. Iterations 0 Lord Kelvin OpenFOAM Running, Solving & CFD 8 March 28, 2016 12:08
Time Dependent Temperature Dependent BC Analysis RP Main CFD Forum 1 March 28, 2008 02:22
Time dependent gate opening krish FLUENT 0 June 17, 2007 02:17
time dependent curve faiz rauf FLUENT 0 August 31, 2004 14:02
Time Dependent Solutions. rakib FLUENT 2 June 28, 2000 08:39


All times are GMT -4. The time now is 16:39.