
[Sponsors] 
October 11, 2013, 23:48 
Urgent help needed in creating UDF's

#1 
New Member
Sharath Chandra. J
Join Date: Sep 2013
Posts: 3
Rep Power: 5 
I am currently working on validation of a small project and it includes flow conditions in parabolic profile and temperature conditions varying in a linear fashion increasing along the Y axis.
Velocity varies as u(y)=12(y(y^2)) and y ranges from 1/6 to 1/2 Temperature varies as θ(y)=(12y) and again y ranges from1/6 to 1/2 My main problem is i don't understand how to define the centreline velocity i.e maximum velocity and temperature conditions. Also from a previous experience, I couldn't include two different UDF's for different boudary conditions. Is it possible to write both the UDF's in a single program I have included all the required data probably. In case anything else is required, I would respond. Please help me out. 

October 12, 2013, 09:55 

#2  
Senior Member
Daniele
Join Date: Oct 2010
Location: Italy
Posts: 998
Rep Power: 17 
Quote:
Please define your equations; if I plot the velocity equation between 1/6 and 1/2 I have negative velocities and the profile of the parabola is not complete. If I translate the parabola and if I plot that translated parabola the profile of the parabola is not complete. Do the same with the T equation. Can you define better your problem? Daniele 

October 12, 2013, 13:12 
RE: Data clarification

#3  
New Member
Sharath Chandra. J
Join Date: Sep 2013
Posts: 3
Rep Power: 5 
Quote:
The problem I am working on is a backward facing step flow with varying expansion ratios. I have to validate the flow conditions in the problem for varying ratios of S/H as shown form the figure. From the paper I've been trying to validate this sentence is verbatim. " The physical domain in the Xdirection is bounded by 0 < x < (30H) and in the y direction it is bounded by –S/DH < y < 1/2.If having the Reynolds number of the flow would be helpful, then it is 800 and the fluid is assumed as water with standard properties. 

Tags 
temperature bc, udf, velocity bc 
Thread Tools  
Display Modes  


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
urgent help needed (rhiechow interpolation problem)  Ardalan  Main CFD Forum  2  March 18, 2011 16:22 
Parse error in UDF, URGENT HELP NEEDED!!!  Boris Kloser  FLUENT  2  December 12, 2009 04:16 
help needed in Turbulent flow (URGENT)  mike  FLUENT  7  November 7, 2008 07:11 
Urgent help needed with spray injection  nick  CDadapco  14  June 29, 2008 18:48 
Urgent Help Needed!  Ken Adams  FLUENT  3  September 25, 2007 23:50 