accessing C_VOF from EXECUTE_AT_END

RD03 · February 11, 2019, 12:49

Hi,
I am trying to access C_VOF from EXECUTE_AT_END macro. I'm getting a fatal error when I run the solver. It is compiling fine. Can anybody help me? and I'm also confused with the zone id and domain id.

here the udf:
DEFINE_EXECUTE_AT_END(alpha)
{
Domain *d;
Thread *t;
Thread **pt;
cell_t c;
int zone_ID=1;
Thread *mixture_thread = Lookup_Thread(d,zone_ID);
pt = THREAD_SUB_THREADS(mixture_thread);

d = Get_Domain(1);

thread_loop_c(t,d)
{
begin_c_loop(c,t)
{

C_UDMI(c,t,0)= C_VOF(c,pt[1]);

C_UDMI(c,t,1)= C_LIQF(c,pt[1]);
}
end_c_loop(c,t)
}
}

AlexanderZ · February 11, 2019, 21:34

which model do you use for this simulation?
Multiphase?
Solidification?
You should explain in details if you wanna get help

Do you know, that:
C_LIQF is available only in fluid cells and only if solidification is turned ON

best regards

RD03 · February 12, 2019, 04:14

Hi AlexanderZ,
I am trying to model melting of phase change material I have separate domain from geometry for air and pcm. I'm using VOF and melting/solidification model in fluent. I want to access the C_VOF and C_LIQF for both the domain( air and pcm).

AlexanderZ · February 12, 2019, 21:48

what kind of error did you get?

did you defined 2 UDMs in FLuent GUI?

best regards

RD03 · February 13, 2019, 08:35

Dear ALexandarZ,
I have specified UDMI in GUI.

RD03 · February 13, 2019, 08:37

I'm getting a segmentation fault when fluent iteration starts.

AlexanderZ · February 13, 2019, 23:39

i dont have much experience in multiphase simulations

may be

Code:

int zone_ID=1;

is a problem. Are you sure, that ID=1 is your fluid zone?
To check this value in fluent GUI go to Cell Zone Conditions, select fluid zone, you will get ID value there.

put it in UDF

best regards

RD03 · February 13, 2019, 23:48

Dear AlexanderZ,
Thanks for your response. I have checked with the zone ID and it worked. Thank you.

February 11, 2019, 12:49	accessing C_VOF from EXECUTE_AT_END	#1
RD03 New Member RD Join Date: Oct 2018 Posts: 8 Rep Power: 7	Hi, I am trying to access C_VOF from EXECUTE_AT_END macro. I'm getting a fatal error when I run the solver. It is compiling fine. Can anybody help me? and I'm also confused with the zone id and domain id. here the udf: DEFINE_EXECUTE_AT_END(alpha) { Domain d; Thread t; Thread *pt; cell_t c; int zone_ID=1; Thread mixture_thread = Lookup_Thread(d,zone_ID); pt = THREAD_SUB_THREADS(mixture_thread); d = Get_Domain(1); thread_loop_c(t,d) { begin_c_loop(c,t) { C_UDMI(c,t,0)= C_VOF(c,pt[1]); C_UDMI(c,t,1)= C_LIQF(c,pt[1]); } end_c_loop(c,t) } }

February 13, 2019, 23:39		#7
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	i dont have much experience in multiphase simulations may be Code: int zone_ID=1; is a problem. Are you sure, that ID=1 is your fluid zone? To check this value in fluent GUI go to Cell Zone Conditions, select fluid zone, you will get ID value there. put it in UDF best regards

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February 11, 2019, 21:34		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	which model do you use for this simulation? Multiphase? Solidification? You should explain in details if you wanna get help Do you know, that: C_LIQF is available only in fluid cells and only if solidification is turned ON best regards

February 12, 2019, 04:14		#3
RD03 New Member RD Join Date: Oct 2018 Posts: 8 Rep Power: 7	Hi AlexanderZ, I am trying to model melting of phase change material I have separate domain from geometry for air and pcm. I'm using VOF and melting/solidification model in fluent. I want to access the C_VOF and C_LIQF for both the domain( air and pcm).

February 12, 2019, 21:48		#4
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	what kind of error did you get? did you defined 2 UDMs in FLuent GUI? best regards

February 13, 2019, 08:35		#5
RD03 New Member RD Join Date: Oct 2018 Posts: 8 Rep Power: 7	Dear ALexandarZ, I have specified UDMI in GUI.

February 13, 2019, 08:37		#6
RD03 New Member RD Join Date: Oct 2018 Posts: 8 Rep Power: 7	I'm getting a segmentation fault when fluent iteration starts.

February 13, 2019, 23:48		#8
RD03 New Member RD Join Date: Oct 2018 Posts: 8 Rep Power: 7	Dear AlexanderZ, Thanks for your response. I have checked with the zone ID and it worked. Thank you.