what is the correct y+ for SST k-omega with default kqQwallfunction/omegawallfunction

Yage · January 1, 2016, 07:48

Dear Foamers,

I am a little bit confused about how to choose the correct yplus for SST k-omega,

Some people insist on y+<=1, but some people(references) suggest(use) 300>y+>30.

My current model is a submerged body closed to free surface under constant water current speed (Re=280000). Type kqRwallfunction/omegawallfunction are used for model k and omega boundary

and the y+ value at the moment without added layers are:

Code:

y+ : min: 1.95390971 max: 233.585105 average: 38.0527751

Please could someone suggest me whether I need to add layers for my current model?
Regards,
Yage

wyldckat · January 1, 2016, 14:40

Quick answer: Google:

Code:

site:www.dicat.unige.it/guerrero/ omega

I believe it's the presentation "A crash introduction to turbulence modelling in OpenFOAM®" has more details on what you're looking for.

I didn't put up a link, because the presentation is updated once in a while and then the link would be broken in a few months from now

Yage · January 1, 2016, 15:18

Quote:

Originally Posted by wyldckat

Quick answer: Google:

Code:

site:www.dicat.unige.it/guerrero/ omega

I believe it's the presentation "A crash introduction to turbulence modelling in OpenFOAM®" has more details on what you're looking for.

I didn't put up a link, because the presentation is updated once in a while and then the link would be broken in a few months from now

Dear Bruno,

The reference is quite useful for me

Many thanks and happy new year!

Regards
Yage

January 1, 2016, 07:48	what is the correct y+ for SST k-omega with default kqQwallfunction/omegawallfunction	#1
Yage Member Yage Join Date: May 2014 Posts: 60 Rep Power: 11	Dear Foamers, I am a little bit confused about how to choose the correct yplus for SST k-omega, Some people insist on y+<=1, but some people(references) suggest(use) 300>y+>30. My current model is a submerged body closed to free surface under constant water current speed (Re=280000). Type kqRwallfunction/omegawallfunction are used for model k and omega boundary and the y+ value at the moment without added layers are: Code: y+ : min: 1.95390971 max: 233.585105 average: 38.0527751 Please could someone suggest me whether I need to add layers for my current model? Regards, Yage

January 1, 2016, 14:40		#2
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,974 Blog Entries: 45 Rep Power: 128	Quick answer: Google: Code: site:www.dicat.unige.it/guerrero/ omega I believe it's the presentation "A crash introduction to turbulence modelling in OpenFOAM®" has more details on what you're looking for. I didn't put up a link, because the presentation is updated once in a while and then the link would be broken in a few months from now Yage likes this. __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

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