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position declaration on a 3D curved surface

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Old   August 16, 2012, 01:50
Default position declaration on a 3D curved surface
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Hi all,
I am simulating a 3D model for heat transfer from a metallic tube to flowing liquid. While the centre of the tube is at the origin (000) with y axis verticle and tube length along the z axis. Since it is symmetry, I'm modeling a half tube, which looks like a horizontal semi cylinder. I wanna declare a heat flux profile around the tube by an UDF, where the heat flux will vary along the Y direction, and that will translate throughout the tube along the z axis. But I don't understand how I can declare the curved surface of the tube in the udf.
Could any of you please help me to get rid of this maze?
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