[pi120]

Hello,

Anybody knows how the field function 'Wall Y+' is defined in STAR-CCM+? From literature it should be:

y+ = u_tao * y / nu

with (each value taken at the first cell of the prism layer, i.e. the one adjacent to the wall):

y = distance from the wall of the cell's centroid [m]
nu = kinematic viscosity [m^2/s]
u_tao = sqrt(tao_w/rho) [m/s]

with
tao_w = wall shear stress [Pa]
rho = density [kg/m^3]

If I create a field function with this definition the value is much different from that of the STAR-CCM+ default field function 'Wall Y+'. At least this happens in the 2D simulation I am running.

Anybody who knows how 'Wall Y+' is defined?


Thanks
Pietro