[malay]

what the problem on my udf ?

I want find summation of VOF


/************************************************** ******************
UDF for VOF summation and displaying it in the
console
************************************************** *******************/
#include "udf.h"
#include "sg_mphase.h"
DEFINE_ADJUST(my_adjust,d)
{
Thread *t;
/*VOF sum. */
real sum_vof=0.;
cell_t c;
thread_loop_c(t,d)
{
begin_c_loop(c,t)
sum_diss += C_VOF(c,t);
end_c_loop(c,t)
}
printf("VOF summation : %g\n", sum_vof);
}

[DaddySpeleo]

And what the problem with your udf ?
What's wrong?

[malay]

when i did iteration . i had a problem and fluent restart

[DaddySpeleo]

sum_diss overflow?
You wrote sum_diss=0 earlier?
Why do you need DEFINE_ADJUST?

[malay]

Originally Posted by DaddySpeleo

sum_diss overflow?
You wrote sum_diss=0 earlier?
Why do you need DEFINE_ADJUST?

I just need to find summations of VOF when [C_VOF (c,t)>0.5 && C_VOF(c,t) <1.0]

[frode]

Originally Posted by malay

what the problem on my udf ?

I want find summation of VOF


/************************************************** ******************
UDF for VOF summation and displaying it in the
console
************************************************** *******************/
#include "udf.h"
#include "sg_mphase.h"
DEFINE_ADJUST(my_adjust,d)
{
Thread *t;
/*VOF sum. */
real sum_vof=0.;
cell_t c;
thread_loop_c(t,d)
{
begin_c_loop(c,t)
sum_diss += C_VOF(c,t);
end_c_loop(c,t)
}
printf("VOF summation : %g\n", sum_vof);
}

I think that you did not determine variable thread "t".
if you use C_VOF(c,t), the "t" should primary_phase or second_phase, not the mixture_phase. but when you hooking the udf, "t" was mixture_phase.

[macfly]

Hi malay,

As DaddySpeleo pointed out, sum_diss is not defined before the loop. (your answer to him looks like you may not have modified this problem)

[malay]

Originally Posted by macfly

Hi malay,

As DaddySpeleo pointed out, sum_diss is not defined before the loop. (your answer to him looks like you may not have modified this problem)

how can i put sum_diss=0 inside loop !! it should out loop , is it ?

[macfly]

Yes, at the same place where you define sum_vof.

You talked about a condition [C_VOF (c,t)>0.5 && C_VOF(c,t) <1.0] and it looks like it's not included in your udf.

Maybe you should start over with a summation example from the UDF Manual, make sure a copy-pasted example works with no error in your model, and then modify it gradually.

[malay]

Originally Posted by macfly

Yes, at the same place where you define sum_vof.

You talked about a condition [C_VOF (c,t)>0.5 && C_VOF(c,t) <1.0] and it looks like it's not included in your udf.

Maybe you should start over with a summation example from the UDF Manual, make sure a copy-pasted example works with no error in your model, and then modify it gradually.

t here is it mix or vap phase ? if vap phase , how can i make a loop for vap phase ?

thanks