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dinonettis April 29, 2008 06:18

Hi everybody, could somebod
Hi everybody,

could somebody tell me how to calculate the Yplus in compressible solvers, please? I've tried to use checkYplus but it needs the file transportproperties that is present only in incompressible solvers....
Thank you in advance,


camoesas September 26, 2011 06:43

HI Everybody,

I am also interested in an utility for calculating Yplus with compressible solver? Isn't there anything?



gooya_mehdy September 26, 2011 15:36

Hi All, I have the same problem:(, could you please answer the question?!
thanks a lot

camoesas October 4, 2011 03:57

really no possibility??

florian_krause October 4, 2011 04:23

In case you are using RANS, did you try the yPlusRAS utility with the -compressible option?


camoesas October 4, 2011 10:07

HI Florian,

Thanks for your hint!
Yeah its working for rhoSimpleFoam! But not for buoyantSimpleFoam. Do you know where I have to check whether y+ or y* is implemented?
( I have read in some threads that in former versions they have implemented y* instead of y+)

Thanks Camoesas

florian_krause October 4, 2011 10:57

OK I should have said in my first post that I never used any compressible solvers in OF, so I am not sure of how much help I am...

Anyway, yPlusRAS with -compressible option needs a rho field (which makes sense, if you think about the definition of the dimensionless wall distance y+ (compressible)). I've just checked that for the OF-1.7.x tutorial buoyantSimpleFoam/buoyantCavity and there is no rho field written out...

What exactly do you mean by y* (defintion)?


camoesas October 6, 2011 05:51

HI Florian,

Yes there´s no rho in time folders, but there´s neither a 'transportProperties' in constant folder. (for buoyantSimpleFoam)

As I know the definition of y* is:

y* = y * u_delta / delta_1 / u_tau

y* := ystar
y := wall distance
u_delta := velocity at outer edge of boundary layer
delta_1 := displacement thickness
u_tau := sqrt ( wallShearStress / rho)


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