Sometimes the stream will develop to a position in which it cannot move anywhere without violating one of the two rules (no flow reversal and no joining itself).

"What surprised me is that we are looking at quite a flow reversal in California," Mr. Mumma of Atlas said.

When flow reversal occurs, the flow is said to be separated from the surface.

When nearing flow reversal, sailing is even more precarious because of vortex formation.

Holodiastolic flow reversal in the descending aorta.

The S sound results from reverberation within the blood associated with the sudden block of flow reversal.

Heart sounds result from reverberation within the blood associated with the sudden block of flow reversal by the valves closing.

Also, the eventual flow reversal will take place much sooner in the intake, due to its smaller air mass.

Once that happens, significant flow reversal begins, driven by the drop in combustion zone pressure.

In modern design nuclear reactors, flow reversal is almost impossible.