Computational fluid mechanics of the blood flow in an aortic vessel with realistic geometry
The intermittent and developing flow through a physiologically realistic model of an aortic arch was analyzed by solving the three dimensional Navier-Stokes equations numerically. The flow solver implemented the SIMPLER algorithm on a structured mesh. The model geometry was described by a set of formulas based on physiological data, obtained from Computed Tomography images. The results show that during diastole a secondary flow vortex with clockwise rotation is formed in the upper aortic arch, whilst in the descending aortic arch a counter-clockwise secondary flow vortex is formed. Both there vortices were still present at late systole. The most noticeable effect of the non-planarity of the geometry is in moving the stagnation point of the secondary flow around the inner wall. In turn, this cause large variation of wall shear stress direction in a narrow region.
KeywordsWall Shear Stress Aortic Arch Secondary Flow Model Geometry Oscillatory Shear Index
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