|August 25, 2011, 16:40||
Turbulent cyclic pipe flow, wall functions and y+
Join Date: Aug 2011
Posts: 2Rep Power: 0
Sorry for the newbie question but I am just learning this stuff.
I have modeled a cyclic pipe in 3D with a modified simpleFoam solver to include a pressure gradient in the Ueqn to drive the flow.
Question is; what is the appropriate value for y+ when using the kEpsilon model with wall functions? Re=38700 so its fully turbulent. My issue is that i would expect the desired y+ to be about ~10.6 corresponding to the intersection of the wall and log laws. After modifying my mesh to achieve this by placing the first node from the wall at y+=10.6 i dont get the desired effect when i plot u+ vs y+. Instead of a 'knee in the curve' at y+=10.6 its closer to y+=25.
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