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yPlusRAS in pisoFOAM

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Old   July 5, 2011, 07:25
Default yPlusRAS in pisoFOAM
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Hello!

I had some troubles with calculating yplus. Well, I use OF-1.7.1, model is Spalart-Allmaras. In terminal after calculating pisoFoam I type yPlusRAS and for all my time steps I have the same result:


Reading field U
Reading/calculating face flux field phi
Selecting incompressible transport model Newtonian
Selecting RAS turbulence model SpalartAllmaras
SpalartAllmarasCoeffs
{
sigmaNut 0.66666;
kappa 0.41;
Cb1 0.1355;
Cb2 0.622;
Cw2 0.3;
Cw3 2;
Cv1 7.1;
Cv2 5;
}

Patch 3 named ground y+ : min: 0 max: 0 average: 0
Patch 6 named nok y+ : min: 0 max: 0 average: 0
Writing yPlus to field yPlus

Why I have this result?
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Old   July 5, 2011, 09:19
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did you specified any wall ?
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Old   July 5, 2011, 09:26
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Quote:
Originally Posted by Eren10 View Post
did you specified any wall ?
yes. As I understand, terminal saw my patches [walls]
Patch 3 named ground y+ : min: 0 max: 0 average: 0
Patch 6 named nok y+ : min: 0 max: 0 average: 0
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Old   July 8, 2011, 04:26
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Or maybe I should create a yPlusRAS file in folder 0 by myself?
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Old   July 8, 2011, 06:05
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Quote:
Originally Posted by Akuji View Post
Or maybe I should create a yPlusRAS file in folder 0 by myself?

which files do you have at constant directory ?

I am using Kepsilon, and I just type yPlusRAS and it works.
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Old   July 8, 2011, 07:17
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Quote:
Originally Posted by Eren10 View Post
which files do you have at constant directory ?
In every directory I have files:
cellToRegion
nut
nuTilda
p
U
y
yPlus

(I use Spalart-Allmaras model).
In y file I saw a lot of numbers, but yPlus is similar to file nut (in structure)
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Old   July 8, 2011, 07:53
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you dont need that files in every directory. at constant/ directory you should have transportProperties RASproperties .. and some of these kind files, check tutorials
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Old   July 8, 2011, 07:57
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Quote:
Originally Posted by Eren10 View Post
you dont need that files in every directory. at constant/ directory you should have transportProperties RASproperties .. and some of these kind files, check tutorials
I don't understand you first time. In /constant directory I ' ve got 3 files: RASPropeties, transportPropeties and turbulencePropeties. They are ok.
I may to attach them.
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Old   July 8, 2011, 08:24
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You can check if yPlusRAS works on a tutorial that runs a turbulence model, try k-epsilon. and than compare your case with that, sorry I am also just a "user"
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Old   August 31, 2011, 05:15
Default y+ without wall function
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I have done simulations with kOmega SST and a wall function, and was able to calculate y+ using the command yPlusRAS.

However, now I want to do similar things, WITHOUT the wall function and integrating through the boundary layers. When I run yPlusRAS after the simulation, I get the message that I do not have a wall patch. I change this in the constant/polyMesh/boundary and I run the command again. Result: y-field can be calculated correctly, but there is still the complaint
Code:
    no nutWallFunction patches
Writing yPlus to field yPlus
What can I do? I don't have a nut wall function, but do I also have to change this in every time step after the simulation?
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