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Численное исследование структуры течения за стенозом, расположенном ниже по потоку от бифуркации брюшной аорты

выпускная квалификационная работа бакалавра

Численное исследование структуры течения за стенозом, расположенном ниже по потоку от бифуркации брюшной аорты

Abstract

Данная работа посвящена исследованию течения в модели бифуркации брюшной аорты и подвздошных артерий среднестатистической конфигурации с наличием стеноза в правой общей подвздошной артерии. Были выполнены параметрические расчёты течения при разной форме стеноза (односторонний и осесимметричный) и степени сужения (STI = 70% и 50%). Было проанализировано влияние формы и степени стеноза на характеристики потока. Анализ проводился методом численного моделирования с помощью программного обеспечения ANSYS CFX. В результате исследования было установлено, что форма и степень стеноза повлияли на структуру течения только в области стеноза. Наличие стеноза повлияло на образование рециркуляционной зоны вверх по потоку, и двух зон ниже по потоку за стенозом, длина которых зависит от формы стеноза. Также форма повлияла на местоположение зон, наиболее подвергнутых поражению сосудистой стенки.

The given work is devoted to studying the flow in the model of the average configuration of abdominal aorta bifurcation and iliac arteries with stenosis in right common iliac artery. Parametric computations of the flow were done for different shapes of stenosis (one-sided and axisymmetric) and different degrees of obstruction (STI = 70% and 50%). The influence of the stenosis shape and degree of obstruction on the flow characteristics was analyzed. The analysis was carried out by the method of mathematical modeling with use of ANSYS CFX software. As a result, shape and degree of stenosis affected the flow structure only in region near the stenosis. Presence of stenosis resulted in formation of reverse flow zone both upstream and downstream. Shape of stenosis influenced the localization of «dangerous» zones – regions mostly prone for lesions.

Keywords

подвздошные артерии, односторонний стеноз, time-averaged wall shear stress, индекс колебаний ÑÐ´Ð²Ð¸Ð³Ð¾Ð²Ñ‹Ñ Ð½Ð°Ð¿Ñ€ÑÐ¶ÐµÐ½Ð¸Ð¹, hemodinamycally significant stenosis, axisymmetric stenosis, рециркуляционные зоны, oscillatory shear index, iliac arteries, гемодинамически значимый стеноз, one-sided stenosis, moment of maximum flow rate, момент максимального Ñ€Ð°ÑÑ Ð¾Ð´Ð°, осесимметричный стеноз, модель бифуркации брюшной аорты, осредненные сдвиговые напряжения, abdominal aorta bifurcation

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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