  The present work examines the downstream vortex evolution behind a cascade of
vortex generators producing counter-rotating vortices in a boundary layer of
negligible streamwise pressure gradient. For the current study, which is an
extension of the model presented in [4], these parameters are all seen to vary
linearly in the downstream direction. Based on the experimental observations
triggered by a previous study, the vortices generated by vortex generators have
been observed to be self-similar for both the axial ($u_z$) and azimuthal
($u_{\theta}$) velocity profiles. The previous model, which is based merely on
$u_z$ and $u_{\theta}$ at one single downstream location, can therefore be
extended to include the downstream development of the vortex using
self-similarity scaling arguments. This knowledge is important for fundamental
understanding as well as for the aspect of applications, for which parametric
experiments can be substantially reduced in terms of required time and cost by
facilitating engineering models.
