Authors: Y.H. Kim, S. Farhat, J.S. Lee
Affilation: WAYNE STATE University, United States
Pages: 417 - 420
Keywords: lattice Boltzmann method, non-Newtonian flow, stent, aneurysm, CFD
The treatment of cerebral aneurysms with a minimally invasive porous stent has recently been proposed to prevent rupture and favor coagulation mechanism inside the aneurysm. But, an irregularly shaped and wide-necked aneurysm makes current stent technology limited. This can cause serious complications such as thrombosis. Any alternative surgical supplies which can be manufactured easily and flexibly performed with complex vessel geometry should provide more options to doctors. The efficiency of a stent is related to a several parameters which are not yet fully understood. In an aneurysm, to resolve the flow characteristics, a lattice Boltzmann method was used in aneurysms with non-Newtonian blood fluid, and results were compared with Newtonian fluid. To ease the code development, a scientific programming strategy based on object-oriented concepts was developed. The goal of this numerical study is to identify how the stent structure, size, shape, porosity and non-Newtonian fluid affect the hemodynamics properties of the flow inside the aneurysm. We used the concept of flow reduction to characterize the stent efficiency. Our results show how the various parameters play important roles and help us to understand the phenomena under different shear rate and rheological blood characteristics.
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