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Song, X.1; Wood, H. C.1

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Computational Fluid Dynamics (CFD) has been widely used in the design and study of implantable rotary blood pumps. The basic functions include the simulation of fluid field in the blood pumps and the calculations of pressure rise for different flow rates and operation conditions. Besides them, some advanced CFD features can he executed to obtain more detailed information that are important and special to blood pumps. The conjugate heat transfer feature was implemented to investigate the temperature rises in the blood through the pumps and surrounding tissues. The transient simulation revealed the pulsatile blood flow due to the heartbeat. Lagrangian particle tracking method allowed for the quantitative prediction for the hemolysis due to the relatively high shear stress, and multicomponent modeling helped to evaluate the platelet deposition and thromobosis. Multiple frame of reference and moving grid technique were used to calculate the stiffness and damping coefficient for magnetic bearing design. The microsized geometry made the choose of turbulence models significant for the accuracy of computation. The CFD results with different turbulence models were compared to the Particle Image Velocimetry (PIV) experimental date to validate the CFD results. The comparison showed k-w model better predict the shear stress level within the near wall regions. CFD proved to he an effective and powerful tool to design, demonstrate and optimize the small size blood pumps.

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