y+ for cells located away from the wall -- CFD Online Discussion Forums

June 20, 2014, 05:58	y+ for cells located away from the wall	#1
aylalisa Senior Member Join Date: Nov 2012 Location: Bavaria Posts: 145 Rep Power: 13	Dear Foamers, according to my understanding y+ values that are computed in the cells next to the wall show the ratio between the laminar and turbulent influences in that cell. $y^+ = y * \frac{u_\tau}{\nu}$ Therefore $\nu$ = $\nu_{lam}$ and $u_\tau$ = wall shear stress velocity (computed with the velocity gradient between a point on the wall and a certain distance, usually first cell center, away from the wall). Which values do I have to use for $u_\tau$ and $\nu$ to compute y+ for cells that are located away from the wall Aylalisa

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