Computational fluid dynamics design and analysis of a passively suspended tesla pump left ventricular assist device

Richard B. Medvitz, David A. Boger, Valentin Izraelev, Gerson Rosenberg, Eric G. Paterson

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

This article summarizes the use of computational fluid dynamics (CFD) to design a novel suspended Tesla left ventricular assist device. Several design variants were analyzed to study the parameters affecting device performance. CFD was performed at pump speeds of 6500, 6750, and 7000rpm and at flow rates varying from 3 to 7 liters per minute (LPM). The CFD showed that shortening the plates nearest the pump inlet reduced the separations formed beneath the upper plate leading edges and provided a more uniform flow distribution through the rotor gaps, both of which positively affected the device hydrodynamic performance. The final pump design was found to produce a head rise of 77mmHg with a hydraulic efficiency of 16% at the design conditions of 6 LPM throughflow and a 6750rpm rotation rate. To assess the device hemodynamics the strain rate fields were evaluated. The wall shear stresses demonstrated that the pump wall shear stresses were likely adequate to inhibit thrombus deposition. Finally, an integrated field hemolysis model was applied to the CFD results to assess the effects of design variation and operating conditions on the device hemolytic performance.

Original languageEnglish (US)
Pages (from-to)522-533
Number of pages12
JournalArtificial organs
Volume35
Issue number5
DOIs
StatePublished - May 2011

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Medicine (miscellaneous)
  • Biomaterials
  • Biomedical Engineering

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