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helP...UDF for h

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Old   April 3, 2004, 12:02
Default helP...UDF for h
  #1
Amir
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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.
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Old   April 7, 2004, 00:29
Default Re: helP...UDF for h
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FJ
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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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