# How to create an inlet with pressure gradient?

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 July 7, 2010, 08:49 How to create an inlet with pressure gradient? #1 New Member   Valentin Join Date: May 2010 Posts: 12 Rep Power: 7 Hello! I would like to create an inlet pressure gradient (with FLUENT) in order to study the behaviour of a pressure probe. This is a work i'm doing for my diploma thesis. Unfortunatly, I don't know how to create this pressure gradient. Could somebody help me please? Regards Valentin

 July 7, 2010, 09:00 #2 New Member   Valentin Join Date: May 2010 Posts: 12 Rep Power: 7 Just a precision: When I say "pressure gradient", I mean I want my pression to be greater on a side of the inlet (a square shape inlet) than on the opposite side (with a linear relation for example). Sorry if what I wrote is not clear, but I'm french and it's a long time I I haven't learn English....

 July 9, 2010, 08:44 #3 New Member   Valentin Join Date: May 2010 Posts: 12 Rep Power: 7 Please, I really need to know how to do that, I have alomost finish my dilploma thesis, but I miss this!!

 July 9, 2010, 09:05 #4 New Member   Denis Palienko Join Date: Jul 2010 Posts: 12 Rep Power: 7 got a similar problem with a temperature profile on a tube. i think you have to use User defined functions. here my example: #include "udf.h" DEFINE_PROFILE(temperature_profile,t,i) { real x[ND_ND]; real z; face_t f; begin_f_loop(f,t) { F_CENTROID(x,f,t); z = x[2]; F_PROFILE(f,t,i) = 343.15 - 20.0*z/1.0; } end_f_loop(f,t) } here i wanna a temp at the begin of 343.15K(z=0m) and at the end 323.15K(z=1m) to watch some more examples download the manual for UDF (Fluent) good luck

 July 12, 2010, 05:49 #5 New Member   Valentin Join Date: May 2010 Posts: 12 Rep Power: 7 Great!! Thank you very much, I found it in the UDF manual. However, I need to give an incidence angle to my pressure gradient (in the two direction x and z, it's a 3d problem), but I haven't find anything about this. An Idea? Regards

 July 13, 2010, 15:15 #6 New Member   Denis Palienko Join Date: Jul 2010 Posts: 12 Rep Power: 7 i recommend to write the function as you think it could be, and write a new thread. i did the same, people answer you mostly if your question is concrete. good luck

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