The profile function Hassan Nima has sent is very useful as a good start to approximate a time-dependant avarage velocity at inlet. Average at the whole crossection of inlet, not position-dependant. The presented pulsatile polynomial is only time-dependant. So the coordinates of the points are unnecessary in this function, but of course you have to loop over the whole inlet. It seems to me, that velocity is in cm/s, but duration of cardiac cycle is unknown. In my opinion appr. 0.8s. For better approximation you have to go through the literature of the subject
Yes, I observed that polynomial. It is better approximation when the range is from 0 to 0.8 seconds. However, the amplitude is a problem. To change the amplitude and move it exactly according to the pulsatile blood flow, the polynomial needs to be disturbed and edited.