# UDF Wall Temperature Problem - Coordinates

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 July 3, 2008, 06:33 UDF Wall Temperature Problem - Coordinates #1 Marc Guest   Posts: n/a Dear Fluent Users, I try to define a wall temperature with DEFINE_PROFILE, the temperature should vary with one of the three GLOBAL coordinates which exist. My wall ist a tube, so geometrically the BC is a cylinder. The variation of the temperature works fine for two dimensions ( x[1] and x[2] ), but not for the third (axial , using x[3]) dimension. Any idea what couldt be wrong? DEFINE_PROFILE(dt_name, thread, i) { face_t f; real x[ND_ND]; real z; begin_f_loop(f, thread) { F_CENTROID(x,f,thread); z=x[3]; F_PROFILE(f, thread, i) = 273 + z*800; } end_f_loop(f, thread) } Thank you in advance.

 July 3, 2008, 11:10 Re: UDF Wall Temperature Problem - Coordinates #2 Remus Guest   Posts: n/a The x vector returned by F_CENTROID(x,f,thread) has three components stored in x[0], x[1], and x[2]. You'll have to use x[2] for the third (axial) component. Remus

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