[Boh]

when executing the following UDF I get segmentation fault error...but i don't get what I'm doing wrong...any help is appreciated (I'm using pressure based solver)

#include "udf.h"
#define Tads 332.6
DEFINE_EXECUTE_AT_END(heat_transfer_coeffcient)
{
real lambda = 9;
real temp, con1=0;
Domain *d;
Thread *t;
face_t f;
cell_t c;
Thread *t_adsorber_interface, *t_symmetry_air;
d = Get_Domain(1);
t_adsorber_interface = Lookup_Thread(d, 8);
t_symmetry_air = Lookup_Thread(d, 17);
begin_f_loop(f, t_symmetry_air)
{
/* F_T gets face temperature. The += will cause all of the face
temperatures to be added together. */
temp += F_T(f, t_symmetry_air);
con1++;
}
end_f_loop(f, t_symmetry_air)

}

[`e`]

Are you sure your boundary IDs are correct (8 and 17)? Otherwise try removing lines of code until you determine the location of the error.

[jbo214]

Get_domain(1); has been causing segmentation fault for me when I interpret the UDF instead of compiling it. I would try and compile your UDFs and see what happens. See this thread.

[Boh]

Originally Posted by `e`

Are you sure your boundary IDs are correct (8 and 17)? Otherwise try removing lines of code until you determine the location of the error.

Thanks for the reply....I don't get any error until I start to loop over the faces...I checked the IDs (I have taken them from the boundary condition in fluent) do you think the problem is that one of the ID refers to an interior type boundary?

[Boh]

Originally Posted by jbo214

Get_domain(1); has been causing segmentation fault for me when I interpret the UDF instead of compiling it. I would try and compile your UDFs and see what happens. See this thread.

I compiled the UDF....and if i compile the UDF only till the face loop i don't get any error...

[`e`]

Do you have single or multiple phases? Multiphase systems require further code for subdomains. Also try: http://www.cfd-online.com/Forums/flu...-boundary.html

[Boh]

Thanks I did it like the in the thread you suggested me and now fluent runs without error...Thanks!

[serene6390]

Hi, Boh,

I used to have the same problem with you. Now I'm trying to compiling the UDF instead of interpreting. But I got an error:

UNC paths are not supported. Defaulting to windows directory. Access is denied.
........
The directory or file cannot be created.

Error: sopenoutputfile: unable to open file for output
Error Object: "libudf\\win64\\2d\\user_nt.udf"

Do you know anything about how to deal with it? It's my first time compiling UDF to Fluent. Do I have to change any path or something?

Thank you so much.

[Boh]

Did you add the enviromental variables in windows?

[serene6390]

Hi, Boh,

Thanks for your reply. But I couldn't understand what you mean.
Could you explain that again?

Thanks a lot.

[Boh]

https://www.researchgate.net/post/Ho..._ANSYS_Fluent2 ....Here the various steps that need to be done in order to set up correctly the enviroment....it's also important that you don't have any spaces in your filename...hope it's helpfull