Effect of turbulent models on left ventricle diastolic flow patterns simulation. Issue 15 (18th November 2019)

• Record Type: Journal Article
• Authors: Jahanzamin, Jahanbakhsh; Fatouraee, Nasser; Nasiraei-Moghaddam, Abbas
• Is Part Of: Computer methods in biomechanics and biomedical engineering. Volume 22:Issue 15(2019)
• Page Start: 1229
• Page End: 1238
• Publication Date: 2019-11-18
• Subjects: Left heart hemodynamics -- mitral valve vortex ring -- fluid-structure interaction -- k-ε -- model -- Spalart-Allmaras (SA) model -- turbulent flow; Biomechanics -- Data processing -- Periodicals; Biomedical engineering -- Periodicals; Biomechanics -- Periodicals; Biomedical Engineering -- methods -- Periodicals; Computing Methodologies -- Periodicals; 612.7
• DOI: 10.1080/10255842.2019.1655642
• Languages: English
• ISSNs: 1025-5842

Abstract

Abstract: Vortex structures, as one of the most important features of cardiac flow, have a crucial impact on the left ventricle function and pathological conditions. These swirling flows are closely related to the presence of turbulence in left ventricle which is investigated in the current study. Using an extended model of the left heart, including a fluid-structure interaction (FSI) model of the mitral valve with a realistic geometry, the effect of using two numerical turbulent models, k-ε and Spalart-Allmaras (SA), on diastolic flow patterns is studied and compared with results from laminar flow model. As a result of the higher dissipation rate in turbulent models (k-ε and SA), vortices are larger and stronger in the laminar flow model. Comparing E/A ratio in the three models (Laminar, k-ε, and SA) with experimental data from healthy subjects, it is concluded that the results from k-ε model are more accurate.