Hello Guys, I want to obtain a coefficient diffusion value with the following UDF code:

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#include "udf.h" #include "sg.h" #include "mem.h"

DEFINE_ON_DEMAND(cor_diff) {

Domain *d;

Domain *sd;

Thread *t, *tc0;

face_t f;

cell_t c;

int ID =6;

real diff1[3];

real fra_mas[3], dens=0.;

real A[ND_ND],ds,es[ND_ND],A_by_es,dr0[ND_ND],dr1[ND_ND];

d = Get_Domain(1);

sd = Get_Domain(2);

t = Lookup_Thread(sd,ID);

begin_f_loop(f,t) {

tc0 = THREAD_T0(t);

c = F_C0(f,t);

INTERIOR_FACE_GEOMETRY(f,tc0,A,ds,es,A_by_es,dr0,d r1);

diff1[0] = C_DIFF_EFF(c,tc0,0);

dens = C_R(c,tc0);

fra_mas[0] = F_YI(c,tc0,0);

C_UDMI(c,t,0) = dens*diff1[0]*fra_mas[0]*dr0[0]*2; } end_f_loop(f,t) }

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but after I have compiled this function and run as "execute on demand" I obtain the error "segmentation violation"... Which error I have made? Thank you for your answers.

Axel

Please check whether you are trying to access something which does not exist as yet. You may be knowing, this is a common error when you try to access a memory that does not exist!

Swarup.

I noted that when I consider the face loop (also with nothing inside it) there is this error... I am trying to use an other loop...