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Highly resolved pulsatile flows through prosthetic heart valves using the entropic lattice-Boltzmann method

Published online by Cambridge University Press:  30 July 2014

B. Min Yun ,
L. P. Dasi ,
C. K. Aidun  and
A. P. Yoganathan
B. Min Yun
Affiliation:
G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive, Atlanta, GA 30332, USA
L. P. Dasi
Affiliation:
Department of Mechanical Engineering, Colorado State University, Campus Delivery 1374, Fort Collins, CO 80523, USA
C. K. Aidun
Affiliation:
G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive, Atlanta, GA 30332, USA Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, 315 Ferst Drive, Atlanta, GA 30332, USA
A. P. Yoganathan*
Affiliation:
G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive, Atlanta, GA 30332, USA Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, 313 Ferst Drive, Atlanta, GA 30332, USA
*
†Email address for correspondence: ajit.yoganathan@bme.gatech.edu
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Abstract

Prosthetic heart valves have been widely used to replace diseased or defective native heart valves. Flow through bileaflet mechanical heart valves (BMHVs) have previously demonstrated complex phenomena in the vicinity of the valve owing to the presence of two rigid leaflets. This study aims to accurately capture the complex flow dynamics for pulsatile flow through a 23 mm St Jude Medical (SJM) Regent™ BMHV. The lattice-Boltzmann method (LBM) is used to simulate pulsatile flow through the valve with the inclusion of reverse leakage flow at very high spatiotemporal resolution that can capture fine details in the pulsatile BMHV flow field. For higher-Reynolds-number flows, this high spatiotemporal resolution captures features that have not been observed in previous coarse resolution studies. In addition, the simulations are able to capture with detail the features of leaflet closing and the asymmetric b-datum leakage jet during mid-diastole. Novel flow physics are visualized and discussed along with quantification of turbulent features of this flow, which is made possible by this parallelized numerical method.

JFM classification

Biological Fluid Dynamics: Biomedical flows Turbulent Flows: Turbulence simulation Vortex Flows: Vortex dynamics
Type
Papers
Information
Journal of Fluid Mechanics , Volume 754 , 10 September 2014 , pp. 122 - 160
Copyright
© 2014 Cambridge University Press 

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