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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  
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Daniele
Join Date: Oct 2010
Location: Italy
Posts: 992
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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 
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