Validation: Total Artificial Heart

For the validation of a Fluid-Structure-Interaction (FSI) simulation of a pulsatile Total Artificial Heart, the calculated vector fields were validated against stereo Particle Image Velocimetry (Stereo-PIV) measurements conducted in a mock circulatory loop. The flow field was compared in one plane parallel to the pusher plate (Figure, top). FSI results were taken from the fifth cardiac cycle to ensure pulse cycle independence. PIV data is not available in the area of the inlet and outlet valves due to limited optical access, whereas in the FSI results the flow is visible in the whole domain.

The numerical model was iteratively improved until a high level of correlation could be observed between the calculations and the experimental data. The main vortexes, general and local flow characteristics and velocity magnitudes are in good agreement, ensuring that the model assumptions and parameters are adequate.

Velocity fields of the FSI simulation (left) and PIV measurements (right) in one slice (top) for different positions of the pusher plate (charts)

 

This work was funded by the Eurpean Union (EU), the German Federal State of North Rhine-Westphalia and the Erich and Hanna Klessmann Foundation.

Publications:

Sonntag SJ, Kaufmann TAS, Buesen MR, Laumen M, Linde T, Schmitz-Rode T, Steinseifer U. Simulation of a pulsatile total artificial heart: Development of a partitioned Fluid Structure Interaction model; J. Fluid. Struct. 2013; 38:187-204, DOI: 10.1016/j.jfluidstructs.2012.11.011

Sonntag SJ, Kaufmann TAS, Buesen MR, Laumen M, Gräf F, Linde T, Steinseifer U. Numerical washout study of a pulsatile Total Artificial Heart; Int. J. Artif. Organs 2014; DOI: 10.5301/ijao.5000306