helP...UDF for h

April 3, 2004, 13:02

Hi I want cooling a ball with flow stream.my rpoblem is forced convection.wall tempreture change wiht time.(unsteady) how can I difine UDF for wall of ball? what is the equation that I must use it to calculate "h"( convection heat transfer coeffienct)? tank yuo. Amir.

April 7, 2004, 00:29

Hi,

To define temperature of the ball, DEFINE_PROFILE is suitable.

If the mesh around ball is very fine(Y+ < 5), the "h" is calculated automatically and this equations are showed in User's Guide. We can not define this "h" as default function except via UDF.

Thank you

FJ

April 3, 2004, 13:02	helP...UDF for h	#1
Amir Guest Posts: n/a	Hi I want cooling a ball with flow stream.my rpoblem is forced convection.wall tempreture change wiht time.(unsteady) how can I difine UDF for wall of ball? what is the equation that I must use it to calculate "h"( convection heat transfer coeffienct)? tank yuo. Amir.

April 7, 2004, 00:29	Re: helP...UDF for h	#2
FJ Guest Posts: n/a	Hi, To define temperature of the ball, DEFINE_PROFILE is suitable. If the mesh around ball is very fine(Y+ < 5), the "h" is calculated automatically and this equations are showed in User's Guide. We can not define this "h" as default function except via UDF. Thank you FJ

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