Wall treatment with SST turbulence model

MissCFD · September 23, 2016, 11:42

Hello, I would like to know if my y+ value is 5.2 for exemple, does CFX do an integration to wall approach (flow resolved until sublayer) ? Because in theory guide, CFX suggests a near wall grid resolution of at least y+<2 but in an old post on this forum, I found that the limits for automatic wall treatment (that used with k-w SST models) are:

Y < 6 : integration to wall approach
Y+ 6-30 : blending of both approaches
Y+ > 30 : standard wall function

Thank you for your help

MissCFD · October 2, 2016, 14:59

Can nobody clarify this point for me please ?

ghorrocks · October 4, 2016, 04:43

I would trust the cfx documentation over a forum post. Go with what the documentation says.

September 23, 2016, 11:42	Wall treatment with SST turbulence model	#1
MissCFD Senior Member Join Date: Aug 2014 Posts: 160 Rep Power: 11	Hello, I would like to know if my y+ value is 5.2 for exemple, does CFX do an integration to wall approach (flow resolved until sublayer) ? Because in theory guide, CFX suggests a near wall grid resolution of at least y+<2 but in an old post on this forum, I found that the limits for automatic wall treatment (that used with k-w SST models) are: Y < 6 : integration to wall approach Y+ 6-30 : blending of both approaches Y+ > 30 : standard wall function Thank you for your help

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October 2, 2016, 14:59		#2
MissCFD Senior Member Join Date: Aug 2014 Posts: 160 Rep Power: 11	Can nobody clarify this point for me please ?

October 4, 2016, 04:43		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	I would trust the cfx documentation over a forum post. Go with what the documentation says.