In hemodynamics, of particular interest is the study of flows in the blood vessels with abnormal blood stream, such as aneurysm (bulging of the local vessel) or stenosis (narrowing of the local vessel). The study of these processes is considerably more difficult due to their non-stationarity because of the pulsed motion of blood. Axisymmetric analytical solutions [1, 2] do not accurately describe the real processes. Numerical and experimental modeling [3] is costly (as the flow is three-dimensional and unsteady), and it is not always possible to set parameters that influence the process in question. Perhaps, approximate solutions analytically obtained in [4, 5] and in this paper may answer some questions related to the study of the specific blood flow in blood vessels (arteries and arterioles).
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