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Old   November 7, 2016, 06:21
Default segmentation_fault_UDF
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Boh
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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)

}
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Old   November 7, 2016, 17:04
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`e`
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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.
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Old   November 7, 2016, 20:02
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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.
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Old   November 8, 2016, 03:55
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Quote:
Originally Posted by `e` View Post
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?
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Old   November 8, 2016, 04:10
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Quote:
Originally Posted by jbo214 View Post
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...
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Old   November 8, 2016, 04:34
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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
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Old   November 9, 2016, 06:51
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Thanks I did it like the in the thread you suggested me and now fluent runs without error...Thanks!
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Old   November 16, 2016, 23:56
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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.
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Old   November 18, 2016, 06:04
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Did you add the enviromental variables in windows?
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Old   November 21, 2016, 14:51
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Hi, Boh,

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

Thanks a lot.
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Old   November 22, 2016, 13:57
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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
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