question about cfx wall function

piyo · November 21, 2012, 13:47

Hi, Everybody,

Do you have an idea about how CFX judges the wall region? In that case, I can notice calculated value on specific nodes are solved by these governing equations or modelled by wall function.

In CFX moddeling guide, it gives a rough ideal which can be determined by or close to boundary thickness. However, I don't think the solver will use this very rough estimation.

It is also suggested by theory guide that the upper limit of Y+ is a function of device Reynolds number, but no further information.

Thank you
Piyo

ghorrocks · November 21, 2012, 18:17

I do not understand your question. Are you asking about how the rough wall model works? Or how it chooses what wall condition to use? Or what y+ ranges is suitable?

November 21, 2012, 13:47	question about cfx wall function	#1
piyo New Member Join Date: May 2012 Posts: 6 Rep Power: 14	Hi, Everybody, Do you have an idea about how CFX judges the wall region? In that case, I can notice calculated value on specific nodes are solved by these governing equations or modelled by wall function. In CFX moddeling guide, it gives a rough ideal which can be determined by or close to boundary thickness. However, I don't think the solver will use this very rough estimation. It is also suggested by theory guide that the upper limit of Y+ is a function of device Reynolds number, but no further information. Thank you Piyo

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November 21, 2012, 18:17		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	I do not understand your question. Are you asking about how the rough wall model works? Or how it chooses what wall condition to use? Or what y+ ranges is suitable?