is there a yStarRAS tool?

immortality · June 9, 2013, 13:13

Hi
is there a tool for y* like y+?

wyldckat · June 9, 2013, 15:23

Hi Ehsan,

AFAIK, there isn't one.

Uhm... didn't you make this bug report: http://www.openfoam.org/mantisbt/view.php?id=835
Here's a very old bug report also on this topic: http://www.cfd-online.com/Forums/ope...-vs-ystar.html - but the answers you got on your bug report was better.

In the mean time, I also found this: http://www.cfd-online.com/Forums/ope...tml#post424723 - post #4 - which was in response to a similar question of yours from a month ago.

So the very big question is: which "yStar" are you looking for?

The only references I found in OpenFOAM's own source code was in these files:

Code:

src/turbulenceModels/incompressible/RAS/LienLeschzinerLowRe/LienLeschzinerLowRe.C
src/turbulenceModels/incompressible/RAS/LienCubicKELowRe/LienCubicKELowRe.C

Both calculate it this way:

Code:

yStar_ = sqrt(k_)*y_/nu() + SMALL

Best regards,
Bruno

immortality · June 9, 2013, 16:48

thanks.I wanted to be confident about this subject.
-----------------------------------
(For Summary):
------------------------
well then yPlusRAS acts as a y* function that is suitable in high-Re turbulent simulation(when the first cell center is in logarithmic region of turbulent boundary layer)
but yPlus tool that is created by cfd-online users is used when we have low-Re meshes(when first cell center is in laminar-sub layer region of turbulent boundary layer)

anaspauzi · September 24, 2022, 04:27

Hi

Quote:

Originally Posted by immortality

Hi
is there a tool for y* like y+?

Did anyone compile this utility, yStarRAS?

Please kindly share.

Thank you

ANAS

dlahaye · September 25, 2022, 15:08

https://www.openfoam.com/documentati...eld-yPlus.html

simpleFoam -postProcess -latestTime -func yPlus

June 9, 2013, 13:13	is there a yStarRAS tool?	#1
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 26	Hi is there a tool for y* like y+? __________________ Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King. To Be or Not To Be,Thats the Question! The Only Stupid Question Is the One that Goes Unasked.

June 9, 2013, 15:23		#2
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,975 Blog Entries: 45 Rep Power: 128	Hi Ehsan, AFAIK, there isn't one. Uhm... didn't you make this bug report: http://www.openfoam.org/mantisbt/view.php?id=835 Here's a very old bug report also on this topic: http://www.cfd-online.com/Forums/ope...-vs-ystar.html - but the answers you got on your bug report was better. In the mean time, I also found this: http://www.cfd-online.com/Forums/ope...tml#post424723 - post #4 - which was in response to a similar question of yours from a month ago. So the very big question is: which "yStar" are you looking for? The only references I found in OpenFOAM's own source code was in these files: Code: src/turbulenceModels/incompressible/RAS/LienLeschzinerLowRe/LienLeschzinerLowRe.C src/turbulenceModels/incompressible/RAS/LienCubicKELowRe/LienCubicKELowRe.C Both calculate it this way: Code: yStar_ = sqrt(k_)*y_/nu() + SMALL Best regards, Bruno immortality likes this. __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

June 9, 2013, 16:48		#3
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 26	thanks.I wanted to be confident about this subject. ----------------------------------- (For Summary): ------------------------ well then yPlusRAS acts as a y* function that is suitable in high-Re turbulent simulation(when the first cell center is in logarithmic region of turbulent boundary layer) but yPlus tool that is created by cfd-online users is used when we have low-Re meshes(when first cell center is in laminar-sub layer region of turbulent boundary layer) __________________ Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King. To Be or Not To Be,Thats the Question! The Only Stupid Question Is the One that Goes Unasked.

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dlahaye Senior Member Domenico Lahaye Join Date: Dec 2013 Posts: 722 Blog Entries: 1 Rep Power: 17	https://www.openfoam.com/documentati...eld-yPlus.html simpleFoam -postProcess -latestTime -func yPlus