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Knowledge extraction to automate CFD analysis in abdominal aneurysm diagnosis and treatment

机译:知识提取可自动进行腹主动脉瘤诊治中的CFD分析

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摘要

In the last few years, advanced simulation tools have been tested in academic researches to evaluate the causes and evolution of abdominal aortic aneurysm (AAA). This study describes the activity of knowledge extraction aimed at automating the CFD analysis of an AAA. A simple benchmark geometry is considered. Knowledge and rules extraction are done by comparing: 2D and 3D CFD solutions, results from Newtonian and non-Newtonian formulations, influence of the prism layer and inlet boundary conditions, and numerical solver schemes. A grid refinement study using the verification and validation approach was done. As a result, finer hexahedral meshes with a prism layer near the vessel walls is necessary to capture the velocity gradient and wall shear stress correctly; a simple Newtonian formulation is enough to capture the fluid flow behaviour. A first step in the validation process is taken through the application of the extracted rules on a real patient's specific geometries.
机译:在过去的几年中,已经在学术研究中测试了先进的仿真工具,以评估腹主动脉瘤(AAA)的原因和演变。这项研究描述了旨在自动进行AAA CFD分析的知识提取活动。考虑一个简单的基准几何。通过比较2D和3D CFD解决方案,牛顿和非牛顿公式的结果,棱镜层和入口边界条件的影响以及数值求解器方案,完成了知识和规则提取。使用验证和确认方法进行了网格细化研究。因此,必须在血管壁附近有一个较细的六面体网格,并带有一个棱镜层,以正确捕获速度梯度和壁的切应力。一个简单的牛顿公式足以捕获流体流动行为。验证过程的第一步是将提取的规则应用于实际患者的特定几何形状。

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