Hybrid RANS-LES Hemolytic Power Law Modeling of the FDA Blood Pump

This study applies the SBES and IDDES hybrid RANS-LES turbulence models along with the K-ω SST model to four flow conditions of the FDA blood pump. Validation of all three turbulence models show good agreement with experimental pressure and velocity fields. Evaluation of turbulent kinetic energy fields for the hybrid models show 80-90+% of kinetic energy is resolved in the rotor and diffuser regions of the pump. Hemolysis power law models were evaluated using the commonly used von Mises stress and additional energy dissipation stress (EDS). Results show viscous and Reynolds stresses computed with the K-ω SST under predict and severely overpredict the total stress of the hybrid models respectively where EDS shows the best agreement across the three turbulence models. Finally, hemolysis is overpredicted for all turbulence models, though EDS power law results across turbulence models show general agreement in magnitude indicating potential for a universal dissipation based model