# UDF in Cylindrical Coordinates

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 April 19, 2012, 03:14 UDF in Cylindrical Coordinates #1 New Member   Aydın Dönmez Join Date: Feb 2012 Posts: 4 Rep Power: 7 dear all, first of all, the problem is 3D and in cylindrical coordinates. i have to specify a tangential velocity profile as a function of radius "r", but i think somthing is wrong with it. the values obtained from the udf does not match with real values (i also computed it with excell). i couldn't understand where the problem is. would you please have a look at the code? thanks! #include "udf.h" DEFINE_PROFILE(velocity_profile,t,i) { real x[ND_ND]; /* this will hold the position vector */ real r,R,omega; face_t f; R=0.1; omega=20; begin_f_loop(f,t) { F_CENTROID(x,f,t); r=sqrt((x[0]*x[0])+(x[1]*x[1])); F_PROFILE(f,t,i) = (omega*R*R/r)*(1-exp(-r*r/R*R)); } end_f_loop(f,t) } Last edited by donmezayd; April 19, 2012 at 04:27.

 Tags cylindrical coordinate, velocity profile

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