Cylinder is rotating at different rpm.
Indira, I am giving below two links that I have used and you may find useful. The second one seems to be affected by the recent shutdown.
http://www.cfd-online.com/Tools/yplus.php
http://geolab.larc.nasa.gov/APPS/YPlus/
Regards, Andrea
Yplus =SQRT[density*distance of first grid point from the wall* (velocity of cylinder-velocity at the first grid point):viscosity].
The same inside and outside.
http://www.pointwise.com/yplus/
https://www.simscale.com/forum/t/what-is-y-yplus/82394
https://www.computationalfluiddynamics.com.au/tips-tricks-cfd-estimate-first-cell-height/
https://www.cfd-online.com/Tools/yplus.php
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