國家衛生研究院 NHRI:Item 3990099045/1478

NHRI > Institute of Biomedical Engineering and Nanomedicine > Ned H. C. Hwang(2000-2008) > Periodical Articles > Item 3990099045/1478

Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/1478

Title:	Numerical simulation of opening process in a bileaflet mechanical heart valve under pulsatile flow condition
Authors:	Shi, YB;Zhao, Y;Yeo, TJH;Hwang, NHC
Contributors:	Division of Medical Engineering Research
Abstract:	Background and aim of the study: Most previous computational fluid dynamics (CFD) studies of blood flow in mechanical heart valves (MHVs) have not efficiently addressed the important features of moving leaflet and blood-leaflet interaction. Herein, computationally efficient approaches were developed to study these features and to obtain better insight into the pulsatile flow field in bileaflet MHVs. Methods: A simple and effective method to track the moving boundary was proposed, and an efficient method for calculating the blood-leaflet interaction applied. In this way, a CFD code was developed to study the pulsatile flow field around bileaflet MHVs. The CFD code was parallelized on a supercomputer to reduce turn-around time in the simulation. The solver was then used to study the opening process in a St. Jude Medical (SJM) size 29 bileaflet MHV. Results: CFD results showed that, in the opening process, the flow field was consistently partitioned into two side channels and a central channel due to the presence of the two leaflets. In the flow field near the surface of the two leaflets, the fluid velocity followed the local surface velocity of the leaflets, thus showing a strong blood-leaflet interaction effect. Throughout the valve-opening process, peak velocities were always observed near the tips of the valve leaflet. The CFD simulation showed that the opening process took similar to0.044 s, which compared well with experimental findings. Conclusion: The new computational approaches were efficient and able to address the moving leaflet and blood-leaflet interaction. The flow field in the opening process of a SJM 29 bileaflet MHV was successfully simulated using the developed solver.
Keywords:	Cardiac & Cardiovascular Systems
Date:	2003-03
Relation:	Journal of Heart Valve Disease. 2003 Mar;12(2):245-255.
Link to:	http://www.ncbi.nlm.nih.gov/pubmed/12701798
Cited Times(WOS):	https://www.webofscience.com/wos/woscc/full-record/WOS:000181752900020
Cited Times(Scopus):	http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0037356105
Appears in Collections:	[Ned H. C. Hwang(2000-2008)] Periodical Articles

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