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    CFD and PTV Steady Flow Investigation in an Anatomically Accurate Abdominal Aortic Aneurysm

    Source: Journal of Biomechanical Engineering:;2009:;volume( 131 ):;issue: 001::page 11008
    Author:
    Evangelos Boutsianis
    ,
    Michele Guala
    ,
    Ufuk Olgac
    ,
    Simon Wildermuth
    ,
    Klaus Hoyer
    ,
    Yiannis Ventikos
    ,
    Dimos Poulikakos
    DOI: 10.1115/1.3002886
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: There is considerable interest in computational and experimental flow investigations within abdominal aortic aneurysms (AAAs). This task stipulates advanced grid generation techniques and cross-validation because of the anatomical complexity. The purpose of this study is to examine the feasibility of velocity measurements by particle tracking velocimetry (PTV) in realistic AAA models. Computed tomography and rapid prototyping were combined to digitize and construct a silicone replica of a patient-specific AAA. Three-dimensional velocity measurements were acquired using PTV under steady averaged resting boundary conditions. Computational fluid dynamics (CFD) simulations were subsequently carried out with identical boundary conditions. The computational grid was created by splitting the luminal volume into manifold and nonmanifold subsections. They were filled with tetrahedral and hexahedral elements, respectively. Grid independency was tested on three successively refined meshes. Velocity differences of about 1% in all three directions existed mainly within the AAA sack. Pressure revealed similar variations, with the sparser mesh predicting larger values. PTV velocity measurements were taken along the abdominal aorta and showed good agreement with the numerical data. The results within the aneurysm neck and sack showed average velocity variations of about 5% of the mean inlet velocity. The corresponding average differences increased for all velocity components downstream the iliac bifurcation to as much as 15%. The two domains differed slightly due to flow-induced forces acting on the silicone model. Velocity quantification through narrow branches was problematic due to decreased signal to noise ratio at the larger local velocities. Computational wall pressure and shear fields are also presented. The agreement between CFD simulations and the PTV experimental data was confirmed by three-dimensional velocity comparisons at several locations within the investigated AAA anatomy indicating the feasibility of this approach.
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      CFD and PTV Steady Flow Investigation in an Anatomically Accurate Abdominal Aortic Aneurysm

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    http://yetl.yabesh.ir/yetl1/handle/yetl/140037
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    contributor authorEvangelos Boutsianis
    contributor authorMichele Guala
    contributor authorUfuk Olgac
    contributor authorSimon Wildermuth
    contributor authorKlaus Hoyer
    contributor authorYiannis Ventikos
    contributor authorDimos Poulikakos
    date accessioned2017-05-09T00:31:51Z
    date available2017-05-09T00:31:51Z
    date copyrightJanuary, 2009
    date issued2009
    identifier issn0148-0731
    identifier otherJBENDY-26856#011008_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/140037
    description abstractThere is considerable interest in computational and experimental flow investigations within abdominal aortic aneurysms (AAAs). This task stipulates advanced grid generation techniques and cross-validation because of the anatomical complexity. The purpose of this study is to examine the feasibility of velocity measurements by particle tracking velocimetry (PTV) in realistic AAA models. Computed tomography and rapid prototyping were combined to digitize and construct a silicone replica of a patient-specific AAA. Three-dimensional velocity measurements were acquired using PTV under steady averaged resting boundary conditions. Computational fluid dynamics (CFD) simulations were subsequently carried out with identical boundary conditions. The computational grid was created by splitting the luminal volume into manifold and nonmanifold subsections. They were filled with tetrahedral and hexahedral elements, respectively. Grid independency was tested on three successively refined meshes. Velocity differences of about 1% in all three directions existed mainly within the AAA sack. Pressure revealed similar variations, with the sparser mesh predicting larger values. PTV velocity measurements were taken along the abdominal aorta and showed good agreement with the numerical data. The results within the aneurysm neck and sack showed average velocity variations of about 5% of the mean inlet velocity. The corresponding average differences increased for all velocity components downstream the iliac bifurcation to as much as 15%. The two domains differed slightly due to flow-induced forces acting on the silicone model. Velocity quantification through narrow branches was problematic due to decreased signal to noise ratio at the larger local velocities. Computational wall pressure and shear fields are also presented. The agreement between CFD simulations and the PTV experimental data was confirmed by three-dimensional velocity comparisons at several locations within the investigated AAA anatomy indicating the feasibility of this approach.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleCFD and PTV Steady Flow Investigation in an Anatomically Accurate Abdominal Aortic Aneurysm
    typeJournal Paper
    journal volume131
    journal issue1
    journal titleJournal of Biomechanical Engineering
    identifier doi10.1115/1.3002886
    journal fristpage11008
    identifier eissn1528-8951
    treeJournal of Biomechanical Engineering:;2009:;volume( 131 ):;issue: 001
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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