Numerical simulation of unsteady laminar flow through a tilting disk heart valve: Prediction of vortex shedding

Zhong-jing, Huang; Merkle, Charles L.; Abdallah, S.; Tarbell, John M.

doi:10.1016/0021-9290(94)90015-9

Cited by 37 publications

(16 citation statements)

References 19 publications

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“…For physiological inflow waveform, 2 or 3 shedding cycles were found during the diastole. These frequencies are in agreement with Huang et al [21] results. It was also shown that vortex shedding is a second-order phenomenon and has smaller effect on global unsteady properties of the flow than pulsatile inflow.…”

Section: Introductionsupporting

confidence: 95%

Numerical Simulation of Blood Flow Through Heart Valves

Nejadmalayeri

Hoffmann

Dietiker

2007

45th AIAA Aerospace Sciences Meeting and Exhibit

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High shear stress in blood flow can cause red cell and platelets damage, hemolysis or thrombus formation. Although vortex shedding has a secondary effect compared to the unsteady effect of pulsatile flow, it can generate free emboli. The objectives of the present effort are numerical investigation of vortex shedding behind a two-dimensional tilting-disk mechanical heart valve using first and several higher-order finite volume schemes as well as examination of non-Newtonian viscosity effect on shedding frequency and amplitude.

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Section: Introductionsupporting

confidence: 95%

Numerical Simulation of Blood Flow Through Heart Valves

Nejadmalayeri

Hoffmann

Dietiker

2007

45th AIAA Aerospace Sciences Meeting and Exhibit

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“…Due to limitation of computing facilities, early research of this kind concentrated on the steady or unsteady flow in aortic and mitral valves in peak systolic phase (Bluestein and Einav, 1994;Huang et al, 1994;Shim and Chang, 1997;Underwood, 1975). As more powerful computers became available, some researchers began to target modelling the moving valve leaflet and blood-leaflet interaction (Kiris et al, 1997;Makhijani et al, 1996aMakhijani et al, ,b, 1997Shi et al, 2003;De Hart et al, 2000, 2003a, 2003bLai et al, 2002).Limitations in computing resources and numerical methods greatly restricted these attempts.…”

Section: Article In Pressmentioning

confidence: 99%

Numerical simulation of cardiovascular dynamics with healthy and diseased heart valves

Korakianitis

Shi

2006

Journal of Biomechanics

136

163

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“…Studies show that at shear rates higher than 100 s Ϫ1 blood can be considered a Newtonian fluid. 31 The non-Newtonian blood behavior can also be very important and needs to be accounted for when analyzing the flow within valves. The use of non-Newtonian blood models normally results in the increase of low wall shear stress by 5% to 8%, as we found out during previous research.…”

Section: Cfd Studymentioning

confidence: 99%

Numerical Dye Washout Method as a Tool for Characterizing the Heart Valve Flow: Study of Three Standard Mechanical Heart Valves

Goubergrits

Kertzscher²,

Affeld³

et al. 2008

ASAIO Journal

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To date, no ideal heart valve prosthesis for the replacement of a diseased natural valve or for use in ventricular assist devices exists. Valves still cause thromboembolic complications originating from thrombus formations in the valve's stagnant and recirculation zones. Optimization of valve design requires detailed flow field investigations. Usually, the regions that are more prone to thrombus formation can be estimated using a dye washout experiment. This successful experimental method was simulated using numerical methods. The proposed method was applied to three standard mechanical heart valves--Björk-Shiley, St-Jude, and Starr-Edwards valve. The dye washout was characterized by a time course of the gray value averaged over a defined region of interest. Finally, these curves were quantified by a half dye time (HDT), which characterizes the blood residence time. The HDT in the best valve, the Starr-Edwards valve, was 0.0747 s. The HDT in the worst valve, the Björk-Shiley, was 0.0942 s. The analysis of the hemodynamic valve parameters (pressure drop, velocity magnitudes and turbulence) revealed that the best valve is the St-Jude valve. The Starr-Edwards valve displayed the worst hemodynamic parameters. This study shows that the proposed numerical method of dye washout visualization can be used as an additional tool for the flow characterization.

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Numerical simulation of unsteady laminar flow through a tilting disk heart valve: Prediction of vortex shedding

Cited by 37 publications

References 19 publications

Numerical Simulation of Blood Flow Through Heart Valves

Numerical Simulation of Blood Flow Through Heart Valves

Numerical simulation of cardiovascular dynamics with healthy and diseased heart valves

Numerical Dye Washout Method as a Tool for Characterizing the Heart Valve Flow: Study of Three Standard Mechanical Heart Valves

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