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Wrong calculation of y+ in flow over backward facing step

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Old   January 26, 2016, 12:02
Question Wrong calculation of y+ in flow over backward facing step
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Hedieh
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Hi everyone,

I'm new to openfoam and trying to find reattachment length of turbulent flow over a backward facing step for my CFD project. the wall shear stress calculation is nearly OK and its almost zero in reattachment point but y+ calculation using yPlusRAS model is significantly different with the documentation. I am unable to figure out why this is happening.
I have provided a few snapshots of y+ and wall shear stress plot for the sake of illustration.

I've done the project with fluent too and I got good resluts for y+ which are in accordance with the documentation.

I'll really appreciate it if anyone could help me with the problem
Thanks in advance

wallshearstress plot.jpg

yplus plot.jpg
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