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Specification of wall function, Y+ in CFX

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Old   June 22, 2010, 05:54
Default Specification of wall function, Y+ in CFX
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Kishore Kumar C
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Hi all,
The manual defines but doesnt seem to help in defining wall function or y+.
Can anybody here worked on that, please tell me where do we define/edit that in CFX

Regards,
Kishore
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Old   June 22, 2010, 19:49
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Glenn Horrocks
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It is all discussed in the documentation under wall boundary conditions.
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Old   June 22, 2010, 22:03
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Kishore Kumar C
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Horrocks, Thanks for your response.
The manual doesn't say where I can specify in the user interface.

If I click over the boundary which is defined as a wall, in the boundary details I can specify the wall influence on the flow or heat transfer.

My objective is to switch off the wall function option to resolve boundary layers or change the y+. I am not able to find that in the user interface and the manual gives the theory and doesn't tell me where I have to do it.

Kindly help!
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Old   June 23, 2010, 08:18
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Glenn Horrocks
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If you use k-e turbulence mode then you have to use wall functions as epsilon is undefined at the wall so you have to do something different to get that under control. If you want to integrate to the wall use a k-w turbulence model. Even better, use the SST turbulence model and it will handle the transition from wall functions to integrating to the wall by itself.
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