problem in udf

pratkb · April 13, 2013, 16:47

Can anyone please help me in using udf in ansys?basically i have to give a parabolic velocity inlet in 2-d geometry using udf.

will be waiting..

A CFD free user · April 13, 2013, 17:08

Hi Pratik
You only need to define your own code by using DEFINE_PROFILE macro and then interpret or compile it. If you only have this simple macro, I suggest you that use interpret option. Afterwards, you should hook it up through Boundary condition/Inlet/ Velocity (x, y direction). Here's the structure of a DEFINE_PROFILE UDF:
DEFINE_PROFILE(your desired name for UDF, t, i)
{
cell_t c;
real x[ND_ND];
define others parameters
real ...
real ...
real ...
begin_c_loop(c,t)
{
C_CENTROID(x,c,t);
F_PROFILE(c,t,i)=......
}
end_c_loop(c,t)
}

Hope it help
Good luck

pratkb · April 13, 2013, 17:55

Thank you very much.I am also following some of the pdf on udf in net.Being very new to this software and eager to learn it,if you please help me about the steps and processings to carry out my job or attach any file,I will be very grateful to you..

The parabolic inlet eqn is 2(1-r/R)^2...

shuai_manlou · April 14, 2013, 00:49

You can find the similar example in FLUENT UDF HELP, make some corrections and you can use it in your own case.

April 13, 2013, 16:47	problem in udf	#1
pratkb New Member pratik Join Date: Apr 2013 Location: India Posts: 6 Rep Power: 13	Can anyone please help me in using udf in ansys?basically i have to give a parabolic velocity inlet in 2-d geometry using udf. will be waiting..

April 13, 2013, 17:08		#2
A CFD free user Senior Member A-A Azarafza Join Date: Jan 2013 Posts: 226 Rep Power: 14	Hi Pratik You only need to define your own code by using DEFINE_PROFILE macro and then interpret or compile it. If you only have this simple macro, I suggest you that use interpret option. Afterwards, you should hook it up through Boundary condition/Inlet/ Velocity (x, y direction). Here's the structure of a DEFINE_PROFILE UDF: DEFINE_PROFILE(your desired name for UDF, t, i) { cell_t c; real x[ND_ND]; define others parameters real ... real ... real ... begin_c_loop(c,t) { C_CENTROID(x,c,t); F_PROFILE(c,t,i)=...... } end_c_loop(c,t) } Hope it help Good luck pratkb likes this. __________________ Regard yours Last edited by A CFD free user; April 29, 2013 at 14:31.

April 13, 2013, 17:55	Udf	#3
pratkb New Member pratik Join Date: Apr 2013 Location: India Posts: 6 Rep Power: 13	Thank you very much.I am also following some of the pdf on udf in net.Being very new to this software and eager to learn it,if you please help me about the steps and processings to carry out my job or attach any file,I will be very grateful to you.. The parabolic inlet eqn is 2(1-r/R)^2... Last edited by pratkb; April 13, 2013 at 18:34.

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April 14, 2013, 00:49		#4
shuai_manlou Member CAO Liushuai Join Date: Apr 2012 Posts: 30 Rep Power: 14	You can find the similar example in FLUENT UDF HELP, make some corrections and you can use it in your own case.