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首页> 外文期刊>Journal of visualization >Wall-PIV as a Near Wall Flow Validation Tool for CFD: Application in a Pathologic Vessel Enlargement (Aneurysm)
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Wall-PIV as a Near Wall Flow Validation Tool for CFD: Application in a Pathologic Vessel Enlargement (Aneurysm)

机译：Wall-PIV作为CFD的近壁流验证工具：在病理性血管增大（动脉瘤）中的应用

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摘要

Flow visualization of a near wall flow is of great importance in the field of biofluid mechanics in general and for studies of pathologic vessel enlargements (aneurysms) particularly. Wall shear stress (WSS) is one of the important hemodynamic parameters implicated in aneurysm growth and rupture. The WSS distributions in anatomically realistic vessel models are normally investigated by computational fluid dynamics (CFD). However, the results of CFD flow studies should be validated. The recently proposed Wall-PIV method was first applied in an enlarged transparent model of a cerebri anterior artery terminal aneurysm made of silicon rubber. This new method, called Wall-PIV, allows the investigation of a flow adjacent to transparent surfaces with two finite radii of curvature (vaulted walls). Using an optical method which allows the observation of particles up to a predefined depth enables the visualization solely of the boundary layer flow. This is accomplished by adding a specific molecular dye to the fluid which absorbs the monochromatic light used to illuminate the region of observation. The results of the Wall-PIV flow visualization were qualitatively compared with the results of the CFD flow simulation under steady flow conditions. The CFD study was performed using the program FLUENT®. The results of the CFD simulation were visualized using the line integral convolution (LIC) method with a visualization tool from AMIRA®. The comparison found a very good agreement between experimental and numerical results.
机译：通常，在生物流体力学领域，特别是对于病理性血管增大（动脉瘤）的研究，近壁流的可视化非常重要。壁切应力（WSS）是牵涉动脉瘤生长和破裂的重要血液动力学参数之一。解剖现实血管模型中的WSS分布通常通过计算流体动力学（CFD）进行研究。但是，CFD流量研究的结果应得到验证。最近提出的Wall-PIV方法首先应用于由硅橡胶制成的大脑前动脉终末动脉瘤的放大透明模型中。这种称为Wall-PIV的新方法可以研究具有两个有限曲率半径的透明表面（拱形壁）附近的流动。使用允许观察到预定深度的颗粒的光学方法，可以仅显示边界层流。这是通过向流体中添加一种特定的分子染料来完成的，该染料吸收用于照亮观察区域的单色光。定性地比较了Wall-PIV流动可视化的结果与稳态流动条件下CFD流动模拟的结果。 CFD研究使用程序FLUENT®进行。使用线积分卷积（LIC）方法和AMIRA®的可视化工具将CFD模拟的结果可视化。比较发现实验结果和数值结果之间有很好的一致性。

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  • 来源
    《Journal of visualization》 |2009年第3期|241-250|共10页
  • 作者

    Goubergrits L.; Weber S.; Petz Ch.; Hege H-Ch.; Spuler A.; Poethke J.; Berthe A.; Kertzscher U.;

  • 作者单位

    Biofluid Mechanics Laboratory, Charite - Universitatsmedizin Berlin, Germany;

    Biofluid Mechanics Laboratory, Charite - Universitatsmedizin Berlin, Germany;

    Visualization and Data Analysis, Zuse-Institute Berlin, Germany;

    Visualization and Data Analysis, Zuse-Institute Berlin, Germany;

    Neurosurgery Department, Helios Hospital Berlin-Buch, Germany;

    Biofluid Mechanics Laboratory, Charite - Universitatsmedizin Berlin, Germany;

    Biofluid Mechanics Laboratory, Charite - Universitatsmedizin Berlin, Germany;

    Biofluid Mechanics Laboratory, Charite - Universitatsmedizin Berlin, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    PIV; wall shear flow; molecular dye; LIC visualization; CFD;

    机译：PIV;墙体剪切流分子染料LIC可视化;差价合约;

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