The plots below show streamlines for a selection of step angles and channel expansion ratios, at Reynolds number of $Re_H=15000$.

The plots below show profiles of the mean and rms streamwise velocity at selected streamwise locations for the channel expansion ratio of $1.48$, $Re_H=47000$ and step angle of $90^o$.

The plots below show profiles of the mean and rms streamwise velocity at selected streamwise locations for the channel expansion ratio of $1.48$, $Re_H=47000$ and step angle of $25^o$.