Influence of Inlet Boundary Conditions on the Prediction of Flow Field and Hemolysis in Blood Pumps Using Large-Eddy Simulation

Inlet boundary conditions (BC) are one of the uncertainties which may influence the prediction of flow field and hemolysis in blood pumps. This study investigated the influence of inlet BC, including the length of inlet pipe, type of inlet BC (mass flow rate or experimental velocity profile) and tur...

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Bibliographic Details
Published in:Bioengineering (Basel) 2023-02, Vol.10 (2), p.274
Main Authors: Xiang, Wen-Jing, Huo, Jia-Dong, Wu, Wei-Tao, Wu, Peng
Format: Article
Language:English
Subjects:
Axial flow pumps
Bioengineering
Blood
blood pump
Blood pumps
Boundary conditions
Centrifugal pumps
CFD
Clinical medicine
Diffusers
flow field
Hemodynamics
Hemolysis
inlet boundary condition
Inlet pipes
Large eddy simulation
Local flow
Mass flow rate
Mathematical models
Performance measurement
Perturbation
Pollutants
Predictions
Pressure head
R&D
Research & development
Reynolds number
Shear strain
Simulation
Turbulence models
turbulent intensity
Velocity
Velocity distribution
Vortices
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Summary:Inlet boundary conditions (BC) are one of the uncertainties which may influence the prediction of flow field and hemolysis in blood pumps. This study investigated the influence of inlet BC, including the length of inlet pipe, type of inlet BC (mass flow rate or experimental velocity profile) and turbulent intensity (no perturbation, 5%, 10%, 20%) on the prediction of flow field and hemolysis of a benchmark centrifugal blood pump (the FDA blood pump) and a commercial axial blood pump (Heartmate II), using large-eddy simulation. The results show that the influence of boundary conditions on integral pump performance metrics, including pressure head and hemolysis, is negligible. The influence on local flow structures, such as velocity distributions, mainly existed in the inlet. For the centrifugal FDA blood pump, the influence of type of inlet BC and inlet position on velocity distributions can also be observed at the diffuser. Overall, the effects of position of inlet and type of inlet BC need to be considered if local flow structures are the focus, while the influence of turbulent intensity is negligible and need not be accounted for during numerical simulations of blood pumps.
ISSN:2306-5354
2306-5354
DOI:10.3390/bioengineering10020274