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problem with Define_on_demand

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Old   April 15, 2009, 08:44
Default problem with Define_on_demand
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R. Roy
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dear all,

this is my code:

#include"udf.h"
#include"dpm.h"
#include"surf.h"
int num_injection = 4;


DEFINE_ON_DEMAND(initalize_udmis)
{
Domain *d=Get_Domain(1);
Thread *tc;
cell_t c;
int injno = 0;

/* Init UDM */
if(injno < num_injection)
{
thread_loop_c(tc,d){
begin_c_loop(c,tc)
{
C_UDMI(c,tc,injno)=0;
}
end_c_loop(c,tc)
}
injno++;
}
}

when i use this code for initializing the User defined memories (i already put the UDM limit to 10); i get segmentation violation.

why is this so ?
can you help me to avoid this problem.

sincerely.
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Old   April 16, 2009, 05:35
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Hi,

unfortunately I can not help you with your problem, but I'm experiencing exactly the same problem. I'm using DEFINE_ON_DEMAND and the UDM brings up a segmentation violation. I'm using FLUENT under Linux AMD 64, what are you using?

regards
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Old   April 16, 2009, 05:48
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Hi again,

I found the solution in this thread: C_UDMI - SEGMENTATION VIOLATION

I don't know why it works this way, but it works.... So You have to display the UDM in the contours before executing the UDF!

cheers
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Old   April 16, 2009, 07:58
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dear sir,

thank you for this very important message and for letting me know the work-around.

sincerely.
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Old   April 17, 2009, 08:03
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i still have problems with the UDF.
the initialization works.
however, the simulation crashes with:
Error: > (greater-than): invalid argument [2]: wrong type [not a number]
Error Object: nan

the UDF is related to the discrete model.
can anyone give some clue what is wrong ?

best wishes.
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Old   May 1, 2009, 14:10
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Hi there, I have the same problem now.... same error, did you find any solution?

cheers
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Old   May 1, 2009, 15:36
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dear sir,

i had since then modfied the code.
the nan however when something in denominator goes 0 or you have a negative exponent.
if you look into those areas, may be it can solve your problem.
i will look of i can help you with this any further if you can paste the code snippet.

good luck.
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