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Effect of spatial inlet velocity profiles on the vortex formation pattern in a dilated left ventricle

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  • Bee Ting Chan
  • Einly Lim
  • Chi Wei Ong
  • Noor Azuan Abu Osman

Abstract

Despite the advancement of cardiac imaging technologies, these have traditionally been limited to global geometrical measurements. Computational fluid dynamics (CFD) has emerged as a reliable tool that provides flow field information and other variables essential for the assessment of the cardiac function. Extensive studies have shown that vortex formation and propagation during the filling phase acts as a promising indicator for the diagnosis of the cardiac health condition. Proper setting of the boundary conditions is crucial in a CFD study as they are important determinants, that affect the simulation results. In this article, the effect of different transmitral velocity profiles (parabolic and uniform profile) on the vortex formation patterns during diastole was studied in a ventricle with dilated cardiomyopathy (DCM). The resulting vortex evolution pattern using the uniform inlet velocity profile agreed with that reported in the literature, which revealed an increase in thrombus risk in a ventricle with DCM. However the application of a parabolic velocity profile at the inlet yields a deviated vortical flow pattern and overestimates the propagation velocity of the vortex ring towards the apex of the ventricle. This study highlighted that uniform inlet velocity profile should be applied in the study of the filling dynamics in a left ventricle because it produces results closer to that observed experimentally.

Suggested Citation

  • Bee Ting Chan & Einly Lim & Chi Wei Ong & Noor Azuan Abu Osman, 2015. "Effect of spatial inlet velocity profiles on the vortex formation pattern in a dilated left ventricle," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 18(1), pages 90-96, January.
    • Handle: RePEc:taf:gcmbxx:v:18:y:2015:i:1:p:90-96
    DOI: 10.1080/10255842.2013.779683
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    References listed on IDEAS

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    1. S. Dahl & J. Vierendeels & J. Degroote & S. Annerel & L. Hellevik & B. Skallerud, 2012. "FSI simulation of asymmetric mitral valve dynamics during diastolic filling," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 15(2), pages 121-130.
    2. Philip J. Kilner & Guang-Zhong Yang & A. John Wilkes & Raad H. Mohiaddin & David N. Firmin & Magdi H. Yacoub, 2000. "Asymmetric redirection of flow through the heart," Nature, Nature, vol. 404(6779), pages 759-761, April.
    3. Federico Domenichini & Gianni Pedrizzetti, 2011. "Intraventricular vortex flow changes in the infarcted left ventricle: numerical results in an idealised 3D shape," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 14(01), pages 95-101.
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