UDF:error while initialisation problem

ravindra · October 20, 2012, 03:03

hello everyone,
i have written udf for radial distribution for eulerian model .....after building nad loading when i initialize it gives the following error
Error:
FLUENT received fatal signal (ACCESS_VIOLATION)
1. Note exact events leading to error.
2. Save case/data under new name.
3. Exit program and restart to continue.
4. Report error to your distributor.
Error Object: #f
can anyone telll me why this error is coming ....i hope someone knows about it...

eng_s_sadeghi · October 20, 2012, 04:35

It means you have forgotten a special thing if defining parameters in both UDF and Fluent. May you please zip a sample case file and the UDF and email me to check?

ghost82 · October 21, 2012, 08:26

Quote:

Originally Posted by ravindra

hello everyone,
i have written udf for radial distribution for eulerian model .....after building nad loading when i initialize it gives the following error
Error:
FLUENT received fatal signal (ACCESS_VIOLATION)
1. Note exact events leading to error.
2. Save case/data under new name.
3. Exit program and restart to continue.
4. Report error to your distributor.
Error Object: #f
can anyone telll me why this error is coming ....i hope someone knows about it...

When initializing don't "compute from"

Daniele

ravindra · October 22, 2012, 01:20

hey friends thank u for ur reply ...

daniele,
i tried to initialise without using "compute from" ....but the error was still there ..

ravindra · October 22, 2012, 01:23

when i use this udf there is problem while initialization..
#include "udf.h"

DEFINE_PROPERTY(cell_raddis,c,t)
{
real rad_dis;
real a_a,v_s;
Thread **pt = THREAD_SUB_THREADS(t);
v_s= C_VOF(c,pt[1]);
a_a=1-pow((v_s/0.63),(1/3));
rad_dis=(3/5)*pow(a_a,-1);

return rad_dis;
}
when i use this udf there is no problem while initialisation but iteration cannot even start even once....it reports divergence problem...
#include "udf.h"

DEFINE_PROPERTY(cell_radial,c,t)
{
real rad_dis;
real a_a;
real void_s;
real void_g;

void_g=C_VOF(c,t);
void_s=1-void_g;

a_a=pow((void_s/0.63),(1/3));
rad_dis=(3/5)*pow((1-a_a),-1);

return rad_dis;
}

kindly look into this....and tell me your opinion...

October 20, 2012, 03:03	UDF:error while initialisation problem	#1
ravindra New Member Join Date: Jul 2012 Posts: 19 Rep Power: 13	hello everyone, i have written udf for radial distribution for eulerian model .....after building nad loading when i initialize it gives the following error Error: FLUENT received fatal signal (ACCESS_VIOLATION) 1. Note exact events leading to error. 2. Save case/data under new name. 3. Exit program and restart to continue. 4. Report error to your distributor. Error Object: #f can anyone telll me why this error is coming ....i hope someone knows about it...

October 20, 2012, 04:35		#2
eng_s_sadeghi Member Join Date: Mar 2011 Posts: 64 Rep Power: 15	It means you have forgotten a special thing if defining parameters in both UDF and Fluent. May you please zip a sample case file and the UDF and email me to check? alagbeuk likes this. __________________ Saeed Sadeghi Ansys Fluent CFD Consultant

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October 22, 2012, 01:20		#4
ravindra New Member Join Date: Jul 2012 Posts: 19 Rep Power: 13	hey friends thank u for ur reply ... daniele, i tried to initialise without using "compute from" ....but the error was still there ..

October 22, 2012, 01:23		#5
ravindra New Member Join Date: Jul 2012 Posts: 19 Rep Power: 13	when i use this udf there is problem while initialization.. #include "udf.h" DEFINE_PROPERTY(cell_raddis,c,t) { real rad_dis; real a_a,v_s; Thread *pt = THREAD_SUB_THREADS(t); v_s= C_VOF(c,pt[1]); a_a=1-pow((v_s/0.63),(1/3)); rad_dis=(3/5)pow(a_a,-1); return rad_dis; } when i use this udf there is no problem while initialisation but iteration cannot even start even once....it reports divergence problem... #include "udf.h" DEFINE_PROPERTY(cell_radial,c,t) { real rad_dis; real a_a; real void_s; real void_g; void_g=C_VOF(c,t); void_s=1-void_g; a_a=pow((void_s/0.63),(1/3)); rad_dis=(3/5)*pow((1-a_a),-1); return rad_dis; } kindly look into this....and tell me your opinion...