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-   -   Strange y+ values (http://www.cfd-online.com/Forums/openfoam-post-processing/67398-strange-y-values.html)

fightingfalcon23 August 13, 2009 14:45

Strange y+ values
 
Hi Foamers,

I have a channel calculated with k-epsilon. I used a compressible solver. But when I try to calculate Y+, I get the following message for each timestep:

Time = 1.9989
Reading field U

Reading/calculating face flux field phi

Selecting incompressible transport model Newtonian
Selecting RAS turbulence model kEpsilon
kEpsilonCoeffs
{
Cmu 0.09;
C1 1.44;
C2 1.92;
C3 -0.33;
alphah 1;
alphak 1;
alphaEps 0.76923;
}

Patch 2 named outerWall y+ : min: 782.702 max: 15960.3 average: 4438.24


So, the tool is "talking" about an incompressible transportModel. The values of y+ are quite strange and i canīt trust them, of course. The result of the simualtion is quite good. For better understanding hereīs the important of my transportModelDict:

transportModel Newtonian;
nu nu [0 2 -1 0 0 0 0] 1e-05;
rho rho [1 -3 0 0 0 0 0] 1;
rho0 rho0 [1 -3 0 0 0 0 0] 1;
psi psi [0 -2 2 0 0 0 0] 1e-5;

Can anybody help me, to get comprehensible values for y+?

Thanks
ff23


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