CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Fluent UDF and Scheme Programming

Ansys FLUENT UDF - Velocity profile (of known values) across edge / surface

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 20, 2011, 07:49
Default Ansys FLUENT UDF - Velocity profile (of known values) across edge / surface
  #1
New Member
 
Emma
Join Date: Sep 2009
Posts: 17
Blog Entries: 1
Rep Power: 7
emmkell is on a distinguished road
Hi

I have a known velocity profile, which i found from experimental testing. It is across a surface and I know the velocity values at 100 points across this surface.

Is it possible to create a UDF to assign these values to 100 points across an edge in Fluent (or say across a known distance with each of the 100 values spread equidistant across the edge)?

Would really appreciate any help, I am reading the UDF manual but it seems the profile UDF's all require an equation to assign the profile.

Thanks!

Emma
emmkell is offline   Reply With Quote

Old   October 20, 2011, 08:39
Default
  #2
New Member
 
FlowLy
Join Date: Aug 2010
Location: Germany
Posts: 18
Rep Power: 6
giuli@ is on a distinguished road
Hi Emma
you can enter a velocity profile as velocity inlet b.c. . If your surface is a wall, the velocity there is zero..
Btw, why do you start your simulation from the results backwards and not the other way round (as it is usually done)..? maybe I didn't get your question!

cheers,

gg
giuli@ is offline   Reply With Quote

Old   October 21, 2011, 13:12
Default
  #3
New Member
 
Tom M
Join Date: Oct 2011
Posts: 7
Rep Power: 5
tmulcahey3 is on a distinguished road
Your best bet is to assign a curve fit to your data and use that equation in your velocity UDF. see DEFINE_PROFILE in the UDF manual for details. You could probably assign the points individually if the mesh geometry matches the distribution of your data points exactly, but that seems like a pain to do since you would have to assign each value individually.
tmulcahey3 is offline   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
Udf for a fully developed velocity profile atinlet philip meppen Fluent UDF and Scheme Programming 6 November 7, 2012 15:30
3D UDF Paraboilc Velocity Profile with max velocity johnGo Fluent UDF and Scheme Programming 1 January 4, 2011 22:45
ATTENTION! Reliability problems in CFX 5.7 Joseph CFX 14 April 20, 2010 15:45
UDF parallel velocity inlet profile Armengol FLUENT 3 September 30, 2009 15:08
surface deposition rate via udf - fluent 6 Greg Perkins FLUENT 1 March 3, 2003 04:01


All times are GMT -4. The time now is 14:26.