wall Y plus

ENGRTAHIR · September 28, 2014, 05:57

I am doing external CFD on irregular body. I have to solve Mach number above 1 and less than 1. I am confuse in wall Y plus. what value should i achieve for subsonic and supersonic flow. can anybody guide me

ghorrocks · September 28, 2014, 06:14

Subsonic/supersonic is irrelevant for y+ selection. What is important is whether you need to resolve down to the viscous sublayer or not.

ENGRTAHIR · September 28, 2014, 06:38

Thanks for reply. Glenn if i resolve the viscous sublayer then will i get my results more accurate

ghorrocks · September 29, 2014, 06:25

What results are you trying to get?

ENGRTAHIR · September 29, 2014, 10:17

gelnn in first phase i will find Cd, Cl and pitching moment coefficient. Then in second phase i will find rolling coefficient

ghorrocks · October 5, 2014, 07:43

It depends on what you are modelling. This conversation is becoming circular.

I would recommend reading a text book on turbulence modelling, such as "Turbulence Modelling for CFD" by Wilcox. You really need a bit of background in these areas so you can understand the implications of your modelling choices.

September 28, 2014, 05:57	wall Y plus	#1
ENGRTAHIR Member tahir Join Date: May 2010 Posts: 35 Rep Power: 15	I am doing external CFD on irregular body. I have to solve Mach number above 1 and less than 1. I am confuse in wall Y plus. what value should i achieve for subsonic and supersonic flow. can anybody guide me

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September 28, 2014, 06:14		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Subsonic/supersonic is irrelevant for y+ selection. What is important is whether you need to resolve down to the viscous sublayer or not.

September 28, 2014, 06:38		#3
ENGRTAHIR Member tahir Join Date: May 2010 Posts: 35 Rep Power: 15	Thanks for reply. Glenn if i resolve the viscous sublayer then will i get my results more accurate

September 29, 2014, 06:25		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	What results are you trying to get?

September 29, 2014, 10:17		#5
ENGRTAHIR Member tahir Join Date: May 2010 Posts: 35 Rep Power: 15	gelnn in first phase i will find Cd, Cl and pitching moment coefficient. Then in second phase i will find rolling coefficient

October 5, 2014, 07:43		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	It depends on what you are modelling. This conversation is becoming circular. I would recommend reading a text book on turbulence modelling, such as "Turbulence Modelling for CFD" by Wilcox. You really need a bit of background in these areas so you can understand the implications of your modelling choices.