Numerical analysis of the flow characteristics of rotary blood pump

Y. S. Morsi, W. Yang, P. J. Witt, A. M. Ahmed, Mitsuo Umezu

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Thrombus formation and hemolysis have been linked to the dynamics of blood flow in rotary blood pumps and ventricular assist devices. Hemolysis occurs as the blood passes through the pump housing, and thrombi develop in stagnation and low-velocity regions. The predicted velocities, pressure, and turbulence quantities from the numerical simulation are used to identify regions of high shear stress and internal recirculation. A numerical technique is described that simulates the hydrodynamic characteristics of a rotary blood pump with a flow rate of 6 1/min at a rotational speed of 3000 RPM. A computational fluid dynamics (CFD) code, CFX 4, is used to solve the time-dependent incompressible Navier-Stokes equations using a transient finite volume method and three-dimensional structured grids. The simulation utilized the sliding mesh capabilities of this numerical code to model the rotating impeller and examine the effect of blade shape on the hydrodynamic performance of the blood pump in terms of pressure rise, flow rates, and energy losses. The first impeller model has six straight channels; the second impeller has six backward-curved channels. The results for two impeller configurations are presented and discussed. The curvedpump design resulted in higher pressure rise and maximum shear stresses than the straight-channel one. In general the paper demonstrates that CFD is an essential numerical tool for optimizing pump performance with the aim of reducing trauma to the blood cells.

Original languageEnglish
Pages (from-to)54-60
Number of pages7
JournalJournal of Artificial Organs
Volume4
Issue number1
DOIs
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

Numerical analysis
Hydrodynamics
Blood
Pumps
Hemolysis
Pressure
Thrombosis
Shear stress
Computational fluid dynamics
Flow rate
Heart-Assist Devices
Finite volume method
Blood Cells
Navier Stokes equations
Energy dissipation
Turbulence
Cells
Wounds and Injuries
Computer simulation

Keywords

  • Centrifugal blood pump
  • CFD
  • Hydrodynamics
  • Numerical simulation
  • Rotary blood pump

ASJC Scopus subject areas

  • Biophysics

Cite this

Numerical analysis of the flow characteristics of rotary blood pump. / Morsi, Y. S.; Yang, W.; Witt, P. J.; Ahmed, A. M.; Umezu, Mitsuo.

In: Journal of Artificial Organs, Vol. 4, No. 1, 2001, p. 54-60.

Research output: Contribution to journalArticle

Morsi, Y. S. ; Yang, W. ; Witt, P. J. ; Ahmed, A. M. ; Umezu, Mitsuo. / Numerical analysis of the flow characteristics of rotary blood pump. In: Journal of Artificial Organs. 2001 ; Vol. 4, No. 1. pp. 54-60.
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