The following sentences of UDF are used to get the coordinates and pressure of the centriods on the specified boundary. And also I want to get the area of the face cells on the boundary to calculate the force. Which macro should I employ in this case and how?Thanks.

begin_f_loop(f,t)

{

F_CENTROID(x,f,t);

fprintf(fload3,"%10.5lf %10.5lf %10.5lf %10.5lf\n",x[0],x[1],x[2],F_P(f,t));

}

end_f_loop(f,t)

Hi,

F_AREA(av, f, t) must be defined and NV_MAG(av) is summed .

--here--

av[ND_ND};

real area;

begin_f_loop(f,t)

{ F_AREA(av, f, t)

F_CENTROID(x,f,t);

fprintf(fload3,"%10.5lf %10.5lf %10.5lf %10.5lf\n",x[0],x[1],x[2],F_P(f,t));

area += NV_MAG(av);

}

end_f_loop(f,t)

---

Thank you

FJ

Thank you very much.It have a litle question.It seems that the array av[ND_ND] should be declared a type"real av[ND_ND]" otherwise Fluent will report some errors occur.

Hi,

Oh,sorry! ."real av[ND_ND]"!.

FJ