Fluid-Structure Interaction in Biological Media / FSI
Alireza Hashemifard; Nasser Fatouraee; Malikeh Nabaei
Volume 17, Issue 3 , December 2023, , Pages 201-210
Abstract
The crucial responsibility of the aortic valve is to prevent returning of blood flow from the aorta back to the left ventricle. In-time and accurate opening and closing of the aortic valve can effectively produce the desired blood pressure and cardiac output. For this reason, aortic valve simulation ...
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The crucial responsibility of the aortic valve is to prevent returning of blood flow from the aorta back to the left ventricle. In-time and accurate opening and closing of the aortic valve can effectively produce the desired blood pressure and cardiac output. For this reason, aortic valve simulation can identify changes related to aortic valve hemodynamics and their relationship. Diagrams of the left ventricular pressure, the left ventricular pressure difference relative to the aortic artery, GOA, blood flow, the left ventricle pressure-to-volume, the left ventricular energy, kinematic energy density, viscous dissipation, valve resistance, fluid pressure difference in two The surface side of the leaflets, and the momentary pressure difference of the longitudinal axis of the aortic valve compared to the pressure of the aortic artery are reported in this research and based on these, the process of opening and closing of the aortic valve is analyzed using numerical methods named ALE. The moving of the aortic leaflet as the displacement of the solid boundary in the fluid-solid interaction method causes the fluid mesh to undergo displacement and change, which is repaired by the sequence of re-meshing in the fluid domain. In this process, problems occur, the details of which and the resolving method are explained in detail.
Fluid-Structure Interaction in Biological Media / FSI
Hamed Khalesi; Hanie Niroomand Oscuii; Farzan Ghalichi
Volume 5, Issue 1 , June 2011, , Pages 67-78
Abstract
Biomechanics believe that, the arteries are remodeled under the influence of hemodynamic and mechanical factors. Biomechanical factors such as Opening Angle and the Tethering could have important effects on this phenomenon. The effects of various Opening Angle and Tethering during thoracic aorta aging ...
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Biomechanics believe that, the arteries are remodeled under the influence of hemodynamic and mechanical factors. Biomechanical factors such as Opening Angle and the Tethering could have important effects on this phenomenon. The effects of various Opening Angle and Tethering during thoracic aorta aging on arterial wall stress have been studied. ADINA software is used for numerical simulation.In this study, for the first time, numerical methods of Fluid-Structure Interaction have been used to study and simulate effects of Opening Angle and the Tethering in elastic artery remodeling due to age. Large deformation theory has been used for modeling changes of arterial radius; furthermore, behavior of Newtonian fluid has been used for blood. Pulsatile pressure and physiological Pulsatile flow waveforms have been applied to simulate transient behavior of arterial system. The results show that opening angle has further effect on circumferential stress so smooth distribution of circumferential stress on the wall accrued. Also, increasing Opening Angle with age reverses the circumferential stress distribution slop across the arterial wall. Tethering has further effect on axial stress. Decreasing Tethering in remodeling process over age leads to increase stress levels in the aged artery. Also, arterial wall shear stress in remodeled artery shows significant reduction in maximum, mean and amplitude values that caused reduction of pathological effects of endothelial cells.
