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January 15, 2013, 06:22 |
UDF for inlet velocity profile
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#1 |
Senior Member
Francisco
Join Date: Mar 2012
Location: Spain
Posts: 273
Rep Power: 15 |
Hi guys,
I'm using a UDF for a velocity profile to define the atmospheric boundary layer in a 2D problem. I've used the attached c code as explained in the user manual, apparently it's interpreted properly but results don't show any influence on the profile, it appears to be just a uniform velocity at the inlet (see attached picture for 5s). 1) Which can be the problem? Is there something wrong in the code? 2) What will happen if I modify the ymax coord in the code so it's higher than the domains's ymax? 3) Also I would like to use a profile for the turbulence intensity (TI), but Fluent only allows me to use it for k and epsilon. Is there a way to use TI and Turbulent Length Scale (TLS) instead of applying the formulae for (TI,TLS)(k,epsilon). 4) I will need to apply the same profile to a 3D case. It will be exactly the same in the x-y plane and constant in the z-direction. Can I use directly the same code? If not, what do I have to modify? Thanks you all! |
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October 6, 2015, 13:53 |
TI Profile
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#2 |
New Member
Join Date: Jul 2012
Posts: 5
Rep Power: 14 |
Hello Bollonga: I have same problems as yours, and I see that you asked this question long time ago! so I assume you have found the answers although no one replied here. I appreciate if you could share what you found with me. My main problem is how to write a UDF to use a profile for TI of an inlet boundary condition.
If you have an example UDF, I appreciate if you share it here. Thanks, Env Quote:
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March 12, 2019, 12:12 |
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#3 |
New Member
Edmundo
Join Date: Jun 2014
Location: Mexico
Posts: 4
Rep Power: 12 |
Quote:
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June 28, 2021, 04:24 |
Turbulent boundary layer 3d problem
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#4 |
New Member
Gutti Lokesh Kalyan
Join Date: Jun 2020
Posts: 1
Rep Power: 0 |
Hello friends.
I am trying to use three velocity components code which is written in c language. Also, the Reynolds stress of R11, R21, R22, R33 was given to test the results. but I am getting wrong plots of u,v,w standard deviation, and UV Reynolds stress. I don't know what is the problem with this code. I am a beginner at coding. I guess the structure is wrong. I am using fluent software to run simulations. Could anyone help me to solve the problem in the code is attached below? Thanks in advance. |
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June 29, 2021, 05:40 |
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#5 |
Senior Member
Alexander
Join Date: Apr 2013
Posts: 2,363
Rep Power: 34 |
your code has 800+ line, I expect it will be hard to find person, who will debug this code instead of you
compilation log: line(53) : warning C4716: 'sort' : must return a value line(60) : warning C4715: 'findY' : not all control paths return a value functions sort and findY could have some problems, check it however, these warnings may not lead to errors.
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best regards ****************************** press LIKE if this message was helpful |
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Tags |
inclined flat plate, inlet, turbulence profile, udf, velocity profile |
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