Simulation of a pulsating flow in a pipe with local constrictions as applied to hemodynamics of blood vessels.

Autor: Mazo, A. B., Kalinin, E. I., Molochnikov, V. M., Dushina, O. A.
Zdroj: Thermophysics & Aeromechanics; Mar2022, Vol. 29 Issue 2, p249-265, 17p
Abstrakt: The oscillating flow of a viscous incompressible fluid in a rigid circular pipe with local constriction has been studied numerically. Fluid viscosity and density, channel diameter and constriction, as well as amplitude-frequency characteristics of the flow rate are identical to those of the blood flow in the human popliteal artery with stenosis. Reynolds number in the area of stenosis is Re ≈ 5·103, dimensionless pulsation frequency is Sh = 0.43·10−3, and normalized constriction of the channel is δ = d/D = 0.4. The flow under consideration is characterized by the fact that during one oscillation period, the fluid flow rate changes direction four times. This contributes to laminar-turbulent transition when the jet discharges from a constriction throat into the main flow. Qualitative features and quantitative parameters of pulsating flow have been determined including distribution of friction stresses along the channel wall. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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