What happens in aorta stenosis? The blood is forced into the aorta via a stenosed valve. This causes the cardiac outflow to become turbulent.
Remarkably, turbulence becomes preceded by a phase of laminar flow that grows in importance towards periphery.
The co-existence of a laminar phase preceding the turbulence of the cardiac ejection phase shows once more that the arterial system is able to add energy to the pressure wave from the heart.