Title :
Hemodynamic aspects of the Berlin ventricle assist device
Author :
Avrahami, I. ; Einav, S. ; Rosenfeld, M. ; Affeld, K.
Author_Institution :
Departement of Biomed. Eng., Tel Aviv Univ., Israel
Abstract :
A new ventricle assist device (VAD), with an improved energy converter unit, was investigated both numerically and experimentally. An experimental continuous digital particle imaging velocimetry (CDPIV) was combined with a computational fluid dynamics (CFD) analysis. These tools complement each other to result in a comprehensive description of the complex 3D, viscous and time-dependent flow field inside the artificial heart ventricle. A 3D numerical model was constructed to simulate the VAD pump and a time-dependent CFD analysis with moving walls was performed to predict the flow field inside the VAD during the cardiac cycle. A commercial finite element package (FIDAP, Fluent Inc., Evanston) was used to solve the Navier-Stokes equations. In the experimental analysis, an optically clear elastic model of the VAD was placed inside a 2D CDPIV system. Continuous flow visualization and CDPIV calculations of the flow were used for validating the CFD simulations. Once validated, the CFD results provide a detailed 3D and time dependent description of the flow field, allowing the identification of stagnation or high shear stress regions.
Keywords :
artificial organs; cardiology; computational fluid dynamics; finite element analysis; flow visualisation; haemodynamics; physiological models; stagnation flow; 2D CDPIV system; 3D numerical model; Berlin ventricle assist device; Navier-Stokes equations; VAD pump; artificial heart ventricle; cardiac cycle; commercial finite element package; complex 3D flow field; computational fluid dynamics; continuous digital particle imaging velocimetry; continuous flow visualization; hemodynamic aspects; high shear stress regions; improved energy converter unit; moving walls; optically clear elastic model; stagnation region; time dependent description; time-dependent CFD analysis; time-dependent flow field; viscous flow field; Analytical models; Artificial heart; Computational fluid dynamics; Computational modeling; Hemodynamics; Image analysis; Numerical models; Optical imaging; Predictive models; Pumps;
Conference_Titel :
Engineering in Medicine and Biology Society, 2001. Proceedings of the 23rd Annual International Conference of the IEEE
Print_ISBN :
0-7803-7211-5
DOI :
10.1109/IEMBS.2001.1018968