==Criteria for a pulsatile flow==

Knick

I am working on a pulsatile flow( generated by a regular-period inlet BC such as sine or cosine) in a tube, and I wonder there is any criteria to indicate the pulsatile flow is steady.

My defination of "steady pulsatile flow" is the flow of which the value of the maximum error between the velocity at the same phase angle of the current cycle as compared to the one at the same phase angle of the previous cycle at computational nodal point(s) (may be one special point or several points)is lower like 0.1%.

Is there any efficient way to work it out? TIA Knick