I have the error of "Undeclared variable" at the line of BOUNDARY_FACE_GEOMETRY. Please help me to fix this error. Here is my UDF.

DEFINE_PROFILE(heat_flux,t,j) { face_t f; cell_t c;

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

begin_f_loop(f,t)

{

real rho,D;

rho = 1;

D = 0.02;

BOUNDARY_FACE_GEOMETRY(f,t,A,ds,es,A_by_es,dr0);

F_PROFILE(f,t,j) = 0.001*540*4187*rho*D*(F_YI(f,t,j)-C_YI(c,t,j))/ds;

} end_f_loop(f,t) }

I think I defined all variables for BOUNDARY_FACE_GEOMETRY, but it says undeclared variable error. I'm writing heat_flux UDF in a function of ds, which is the distance between cell and face centroids. Please help me in this. Best.

Have you included sg.h file???

you havent defined cell thread for C_YI.

you can use something like cell_thread = THREAD_T0(t); c = F_C0(f,t);

I appreciate all your responses. I just included sg.h and tried to fix with cell thread. I think I defined cell thread in cell_t = c; What is the difference with defining cell_thread = THREAD_T0(t); ? Could you add the new macros to my code to understnad? I'm confused with cell_thread and cell_t and don't know the meaning of c = F_C0(f,t). Thank you guys again and please help me one more time.

Kyung

I think I understand what Alec mentioned.. But I'm still having error of "structure reference not implemented" at the line of " BOUNDARY_FACE_GEOMETRY(.....); " Please check my new code;

DEFINE_PROFILE(heat_flux,t,j) {

Thread *cell_thread;

face_t f; cell_t c;

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

begin_f_loop(f,t)

{

real rho,D;

rho = 1;

D = 0.02;

cell_thread = THREAD_T0(t);

c = F_C0(f,t);

BOUNDARY_FACE_GEOMETRY(f,t,A,ds,es,A_by_es,dr0);

F_PROFILE(f,t,j) = 0.001*540*4187*rho*D*(F_YI(f,t,j)-C_YI(c,t,j))/ds;

} end_f_loop(f,t) }

Am I missing defining any parameters? or could be other problems. Please help me out.

Best regards,

Kyung

The reason for using tc = THREAD_T0(t) is that face threads and cell threads are not the same. When using C_YI, a cell thread is required not a face thread. I have compiled the code below with no errors....hope it works for you!

#include "udf.h" #include "sg.h" DEFINE_PROFILE(heat_flux,t,j) {

Thread *tc;

face_t f; cell_t c;

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

begin_f_loop(f,t)

{

real rho,D;

rho = 1;

D = 0.02;

tc = THREAD_T0(t);

c = F_C0(f,t);

BOUNDARY_FACE_GEOMETRY(f,t,A,ds,es,A_by_es,dr0);

F_PROFILE(f,t,j) = 0.001*540*4187*rho*D*(F_YI(f,t,j)-C_YI(c,tc,j))/ds;

} end_f_loop(f,t) }

Thank you so much Alec Eiffel. I appreciate your response. It seems like the code is right now, but I wasn't able to complie this UDF in XP nor Unix. Error comes from "nmake". And can I know the reason why I need to complie it? can I just interprete it? When I tried to interprete, I had error at the line of BOUNDARY_FACE_GEOMETRY(f,t,A,ds,es,A_by_es,dr0); saying "structure reference not implemented". Please help me for last time,I truely need your help. Thank you.

Kyung

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