Key result
The k-ε turbulent model provided more accurate E/A ratio results compared to the Spalart-Allmaras and laminar flow models when simulating left ventricle diastolic flow patterns.
Why the study?
Vortex structures strongly impact left ventricle function and pathological conditions, and are closely related to turbulence in the left ventricle.
Do numerical turbulent models (k-ε and Spalart-Allmaras) provide more accurate simulations of left ventricle diastolic flow patterns compared to laminar flow models?
Do numerical turbulent models (k-ε and Spalart-Allmaras) provide more accurate simulations of left ventricle diastolic flow patterns compared to laminar flow models?
The k-ε turbulent model provides more accurate simulations of left ventricular diastolic flow patterns and E/A ratios than laminar flow models.
k-ε model may enhance LV diastolic CFD accuracy; leaves open in vivo validation before clinical adoption.
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.
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Jahanzamin et al. (2019) studied Left ventricle diastolic flow patterns. k-ε and Spalart-Allmaras (SA) turbulent models vs. Laminar flow model was evaluated on E/A ratio accuracy compared with experimental data. The k-ε turbulent model provided more accurate E/A ratio results compared to the Spalart-Allmaras and laminar flow models when simulating left ventricle diastolic flow patterns.
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