To all fluent experts all over the world,

Thank you for those who willing to send the UDF manual to me especially David and Mukkaram. I am facing a big problem. I need to define a BC for mass fraction for a wall BC which :

Mass fraction in the BC not change with the mass fraction from the previuos cell.

C_YI (BC) = C_YI (before/adjacent with BC)

When i iterate, BC wall mass fraction = initiate guess value. May i know how to solve this problem??

Here is the UDF.....

DEFINE_PROFILE(solute, thread, position) { real z;

face_t f;

cell_t c = F_C0(f,thread) ;

Thread *t= THREAD_T0(thread);

begin_f_loop(f,thread); {z = C_YI(c,t,i); F_PROFILE(f, thread, position) = z ;}

end_f_loop(f, thread);}

Thank you .

From

KKLAU

Hi,

you have to specify "i" of C_YI(c,t,i). This "i" shows species number and should be specified by you. And z=C_YI(c,t,i) should be changed as z=C_YI(c,thread,i).

Thank you.

FJ