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

Species concentration at the flow exit

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 22, 2005, 02:06
Default Species concentration at the flow exit
  #1
Kavitha
Guest
 
Posts: n/a
Hi, I do species conservation modeling in Fluent 6.2.

I write UDFs for each of these species using DEFINE_SOURCE macro which I hook to the sources in Fluid panel.

But when it comes to the fluid exit ( I assign a pressure-outlet at this boundary) Fluent asks me for species concentration at this boundary,which I dont know and expect Fluent to do it for me.Given that I know inlet species concentration, how should i overcome this?

Should I write a UDF using DEFINE_PROFILE macro that calculates the species concentration (using C_YI(c,t,i)) at this boundary? Will this work?

Please help,

Kavitha.
  Reply With Quote

Old   May 22, 2005, 04:31
Default Re: Species concentration at the flow exit
  #2
yhpcgame
Guest
 
Posts: n/a
I have the same question........
  Reply With Quote

Old   May 24, 2005, 00:15
Default Re: Species concentration at the flow exit
  #3
kyung
Guest
 
Posts: n/a
I get the same problem. How do I solve this? Can I use outflow? then what is the flow rate weighting gonna be?
  Reply With Quote

Old   May 24, 2005, 15:21
Default Re: Species concentration at the flow exit
  #4
us
Guest
 
Posts: n/a
No knowledge of perticular multispecies flow. However, would "OUTFLOW" boundary condition where you don't need to specify anything help? -US
  Reply With Quote

Old   May 26, 2005, 07:16
Default Re: Species concentration at the flow exit
  #5
Shiju G,Thomas
Guest
 
Posts: n/a
I think fluent asks only for backflow species concentration on a pressure outlet.I have not yet used Fluent 6.2 but have used 6.1.
  Reply With Quote

Old   May 28, 2005, 08:24
Default Re: Species concentration at the flow exit
  #6
SIVAKUMAR
Guest
 
Posts: n/a
Hai,

please give me some idea to write udf for combustion of solid fuel. bcz i'm struggling with this problem.

help me please.

  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
Species Transport with Multiphase flow in FBR venkat FLUENT 1 July 24, 2008 00:53
Laminar flow in species transport model? Neha Rao FLUENT 7 February 25, 2006 03:23
Can 'shock waves' occur in viscous fluid flows? diaw Main CFD Forum 104 February 16, 2006 06:44
Flow exit out of wind tunnel Peta FLUENT 1 February 3, 2006 10:15
swirl flow, B.C. for exit? victor FLUENT 1 December 11, 2001 02:46


All times are GMT -4. The time now is 23:14.