problem with UDF

nikiii · May 25, 2013, 13:32

Hi,
I solved a UDS for voltage.
Now I am trying to obtain the derivative of voltage by writing this UDF:
# include "udf.h"
# define domain_ID 1
DEFINE_ON_DEMAND(store_gradient)
{
Domain *domain;
cell_t c;
Thread *t;
domain=Get_Domain(1);
thread_loop_c (t,domain)
{
begin_c_loop (c,t)
{
C_UDMI(c,t,0) = NV_MAG(C_UDSI_G(c,t,0));
}
end_c_loop (c,t)
}
}
It compiled successfully, but when I display the contour of UDM, in all the domain it has magnitude zero!!!
What's the wrong
Thank you for advising me.

shashank312 · May 26, 2013, 03:01

What is the UDS equation you are solving?

rou · May 26, 2013, 08:28

Hello,I have a problem with UDF
in fluent a message appear:
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: ()
can any one help me

shashank312 · May 26, 2013, 13:56

Post your UDF here and folks will take a look.

nikiii · May 27, 2013, 11:39

hi;
thank you for your attention.
but i solved my problems.
dear rou after compiling your UDF you must press enter in fluent page then type solve/set/expert and press enter. you must type yes in front of the second text "keep temporary solver memory from being freed?". after it you can execute on demand.
good luck.

rou · May 29, 2013, 07:36

hi,
thank you for your help nikiii but when I initialize the program it write no UDF
I don't know what's the problem?

May 25, 2013, 13:32	problem with UDF	#1
nikiii New Member neda rahimi Join Date: May 2013 Posts: 13 Rep Power: 13	Hi, I solved a UDS for voltage. Now I am trying to obtain the derivative of voltage by writing this UDF: # include "udf.h" # define domain_ID 1 DEFINE_ON_DEMAND(store_gradient) { Domain domain; cell_t c; Thread t; domain=Get_Domain(1); thread_loop_c (t,domain) { begin_c_loop (c,t) { C_UDMI(c,t,0) = NV_MAG(C_UDSI_G(c,t,0)); } end_c_loop (c,t) } } It compiled successfully, but when I display the contour of UDM, in all the domain it has magnitude zero!!! What's the wrong Thank you for advising me.

May 27, 2013, 11:39		#5
nikiii New Member neda rahimi Join Date: May 2013 Posts: 13 Rep Power: 13	hi; thank you for your attention. but i solved my problems. dear rou after compiling your UDF you must press enter in fluent page then type solve/set/expert and press enter. you must type yes in front of the second text "keep temporary solver memory from being freed?". after it you can execute on demand. good luck. yashganatra likes this.

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May 26, 2013, 03:01		#2
shashank312 Member Shashank Join Date: Apr 2011 Posts: 74 Rep Power: 15	What is the UDS equation you are solving?

May 26, 2013, 08:28		#3
rou New Member arough Join Date: Mar 2013 Location: tunisia Posts: 24 Rep Power: 13	Hello,I have a problem with UDF in fluent a message appear: 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: () can any one help me

May 26, 2013, 13:56		#4
shashank312 Member Shashank Join Date: Apr 2011 Posts: 74 Rep Power: 15	Post your UDF here and folks will take a look.

May 29, 2013, 07:36		#6
rou New Member arough Join Date: Mar 2013 Location: tunisia Posts: 24 Rep Power: 13	hi, thank you for your help nikiii but when I initialize the program it write no UDF I don't know what's the problem?