Evaluation of Reference Velocity u*

Spalart and Allmaras devised the model such that would remain constant throughout the viscous sublayer as well as in the log region. However, they concede that " does not follow its ideal linear log-law behavior far up..." This means that the assumption of a linear relationship will cause inaccuracies in at large values. In STAR-CCM+, a proprietary quadratic relation is used that yields more realistic values of for coarse meshes.