Identification and modeling the pulsatile blood flow in the cardiovascular system using a zero-dimensional model in an electrical analogy

摘要

Advanced computer technology tools, like computational fluid dynamics (CFD) and knowledge about the functioning of the human blood circulatory system, structure ofblood, behaviorof vessels –allow improving understanding the process of blood distribution in human body. Complex simulation has to assume multiphase approach, walls elasticity and pulsating blood flow conditions, resulting from work of the heart [1]. In the presented work the blood flow and pressure were simulated.The characteristic impedance, peripheral resistance, capacitance in the systemic peripheral vas-cular beds had been taken into the considerationin electrical analogues as a lumped parameter model (LPM) of the circulatory system which will be implemented as a boundary conditions in the complete CFD model on the inlet of ascending aorta and on the outletsof descending aorta, innominate artery, left common artery and left subclavian artery [2]. The resistance in a vessel was modeled by electronic component –resistor. The blood flow is not stationary, it is stored (e.g. in the vessels and kidneys) just like energy in the capacitors. Coil is an analog to the inert tendency of blood, which mass resists to move due to the pressure difference. Furthermore it can be assumed that flow has only one direction –so vessels act like a diodes in electronic circles. Additionally the conservation of the mass principle has been applied converted into the Kirchhoff’s law [3].