udf problem!!

Guevara

I want to konw how to write udf forms. I wrote my udf form.

Can anybody teache me ?

I want to add source term in any region

The equation is the Q=5*jc*kb*(t1-t2)/2*e.

t2 is wall temperature(known) and t1 is the temperature of the air in the cell closest to the wall(unkown).

l l

l l

l l

l l

t1 t2

DEFINE_SOURCE(cathode_source, c, t, dS, eqn)

{ real x[ND_ND];

real source;

face_t f;

C_CENTROID(x,c,t);

C_T(c,t);

C_T(F_C1(f,t), t);

source=fabs(Jc)*5*kb*(C_T(c,t)-temp_a)/(2*e);

dS[eqn]=0.0;

return source;

}

anyboby help me plz!!

-Guevara