Abstract-
This talk will describe numerical studies on the hemodynamical properties of
Mechanical Heart Valves (MHV) and pulsatile Ventricular Assist Devices (VAD).
The first study includes numerical simulations of the flow across tilting-disk
and bileaflet MHV in a straight tube and in a simplified model of the natural
left ventricle. Specific fluid-structure interaction (FSI) coupling algorithms
were developed to couple the motion of the valve's leaflets with the calculated
flow. The characteristics of the coupled flow and structure dynamics during the
complete cycle, and in particular during closure will be described. The second
study describes the effect of several design aspects on the flow inside a
sac-type pulsatile VAD. The numerical analyses included FSI coupling to
describe the interaction between the flow in the blood chamber and the flexible
walls. Different hemodynamic aspects, including washout properties and risk for
thrombosis will be discussed. The results obtained from both studies are
compared to experimental analyses including Particle Image Velocimetry (PIV).
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