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is there a yStarRAS tool?

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Old   June 9, 2013, 13:13
Default is there a yStarRAS tool?
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Ehsan
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Hi
is there a tool for y* like y+?
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Old   June 9, 2013, 15:23
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wyldckat is just really nicewyldckat is just really nicewyldckat is just really nicewyldckat is just really nice
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: yPLUS vs. ySTAR - but the answers you got on your bug report was better.

In the mean time, I also found this: Yplus and ystar - 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
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Bruno
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Old   June 9, 2013, 16:48
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thanks.I wanted to be confident about this subject.
-----------------------------------
(For Summary):
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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)
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