y+ and surface roughness -- CFD Online Discussion Forums

October 31, 2009, 13:54	y+ and surface roughness	#1
zebG New Member RobT Join Date: Aug 2009 Posts: 9 Rep Power: 16	Starting with a model which has a yPlus less than 9 when a surface is smooth, if I change the surface to 1mm roughness, the y+ increases by a factor of 10. Does this mean that the mesh needs to be refined again to reduce the y+ or does the inevitability of the high y+ reduce the importance? Basically, has everyone found it to be the case that a low y+ as important with a smooth as a rough model? I assume that the answer's yes, but just wanted to check before increasing simulation time significantly.

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