Why the study?
The study evaluated whether Newtonian models can replace non-Newtonian models in ventricular assist device simulations.
Do Newtonian models accurately predict performance and shear stress compared to non-Newtonian models in ventricular assist device simulations?
Do Newtonian models accurately predict performance and shear stress compared to non-Newtonian models in ventricular assist device simulations?
Newtonian models can accurately and efficiently replace non-Newtonian models for performance predictions in high-shear regions of ventricular assist devices.
Newtonian models may simplify high-shear VAD simulations; leaves open validation for hemolysis prediction before clinical modeling adoption.
This study evaluates whether Newtonian models can replace non-Newtonian models in ventricular assist device (VAD) simulations. Five rheological models were compared in an axial-flow VAD using ANSYS CFX. High-shear conditions (92% > 300 s−1 rendered non-Newtonian effects negligible, with errors <1% for pressure rise, efficiency, and torque. Wall shear stress variations were minimal (±5 Pa) and below hemolysis thresholds. Newtonian models suffice for performance predictions in high-shear regions, reducing computational costs by 30–50%. However, localized non-Newtonian effects in stagnation zones may need analysis for thrombogenicity. These findings streamline VAD design without compromising accuracy.
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Bounouib et al. (2025) studied this question.
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