The study presents a mesh dependency study for a carotid artery bifurcation geometry of a real-life specimen. The results of time-averaged velocity profiles at artery control surfaces and wall shear stresses are compared between a set of structured and unstructured meshes, with varying non–dimensional boundary layer first element thickness (y+) parameter. A set of four meshes in total is considered: a full–hexagonal structured mesh, an unstructured tetrahedral mesh with prism inflation layer, both created for y+=1 and y+=30. Apart from numerical results, overall mesh creation work time, overall analysisstability are compared with the mesh quality results: cell non–orthogonality, cell skew and aspect ratio. Numerical results are validated against results of real–life CT examination performed in Poznań Medical University.

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During the surgery of atherosclerotic plaques removal, a longitudinal artery incision is made. Frequently used practice is sewing a patch in the incision area. It reduces the risk of narrowing of the artery but also causes its widening. The channel expansion leads to the enhancing separation of the boundary layer and vortexes creation. The selection of the patch size is based on the surgeon’s experience. The purpose of the studies is to determine a new geometric concept of a patch. The resultingpatch is fully parameterizedand can be influenced by its geometric shape, adapting it to the patient’s diameter. Simulations of blood flow in the artery were performed, with the patch used during the surgery and a patch developed by the authors. The analysis of the flow field in terms of the wall shear stresses (WSS) and velocity distribution has shown, that the patch developed by authors give the most satisfactory results.

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