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Old   May 21, 2003, 10:41
Default Temperature boundary layer
Conny Larsson
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Hello CFD lovers

I am working with a flow case involving convective heat transfer. I the use k-epsilon model and standard wall functions. My wall y+ values are within the region 100-150. This is ok for the velocity boundary layer when using standard wall functions but I am not sure if it is okay for the temperature boundary layer. I think I have read somewhere that y+ should not exceed 100 for the temperature law-of-the-wall. Can anyone with experience in this field give me some advice or give me a hint where I can find more info about this?

Thanks in advance

Conny L
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Old   May 21, 2003, 12:00
Default Re: Temperature boundary layer
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Actually, y+ should be between 30 and 60 for both velocity and temperature boundary layer. And it's better to keep y+ close to 30 (see FLUENT manual).

You should find more info in this book:

Turbulence Modelling for CFD D.C. Wilcox 1993 ISBN 0-9636051-0-0

For a list of books about CFD visit for example this site:


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