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Title:	Modeliranje toka krvi skozi žilno opornico z uporabo večfaznega modela zvezne tekočine : magistrsko delo
Authors:	ID Bezjak, Jaka (Author) ID Iljaž, Jurij (Mentor) More about this mentor... ID Zadravec, Matej (Comentor)
Files:	MAG_Bezjak_Jaka_2024.pdf (4,61 MB) MD5: 01ACD873E15DB6FAA4D5A850C8CD4221
Language:	Slovenian
Work type:	Master's thesis/paper
Typology:	2.09 - Master's Thesis
Organization:	FS - Faculty of Mechanical Engineering
Abstract:	V tem delu je predstavljen pristop modeliranja toka krvi kot enofazni in večfazni sistem, skozi žilno opornico na poenostavljeni geometriji. Predstavljene so bile dosedanje ugotovitve na področju računske dinamike tekočin krvi, vodilne enačbe v posameznem pristopu ter trije pristopi večfaznega sistema. Za večfazni pristop je bil izbran pristop Euler-Euler. V enofaznem sistemu je kri obravnavana kot Newtonska ter nenewtonska tekočina, medtem ko je v večfaznem sistemu obravnavana kot štiri fazna zmes. Izvedene so bile tri simulacije ustaljenih razmer ter ena časovno odvisna simulacija na enofaznem nenewtonskem modelu. Za izvedbo simulacij je bil uporabljen programski paket ANSYS Fluent 2023 r1. Rezultati so bili analizirani v programu CFD Post, kjer smo opazovali vpliv žilne opornice na strižno napetost. Opazili smo področja manjše strižne napetosti med opornicami ter razlike med notranjo in zunanjo stranjo žile. Dobljene rezultate smo primerjali z referenčnim člankom. Enofazni modeli so bili skladni s člankom, pri čemer je bil nenewtonski model malenkost boljši, medtem ko so rezultati večfaznega modela bistveno odstopali. Iz tega smo sklepali, da je za potrebe analiziranje žilne opornice pristop enofazne tekočine primernejši, medtem ko je prednost večfaznega modela v možnosti vpogleda porazdelitev posameznih faz oziroma krvnih delcev. Na koncu smo tudi našteli omejitve večfaznega pristopa in raziskali možnosti za izboljšavo.
Keywords:	Tok krvi, opornica, nenewtonska tekočina, večfazni sistem, numerična simulacija, strižna napetost.
Place of publishing:	Maribor
Place of performance:	Maribor
Publisher:	[J. Bezjak]
Year of publishing:	2023
Number of pages:	1 spletni vir (1 datoteka PDF (XI, 46 str.))
PID:	20.500.12556/DKUM-85581
UDC:	532.5-047.58:612.13(043.2)
COBISS.SI-ID:	216347651
Publication date in DKUM:	04.01.2024
Views:	480
Downloads:	67
Metadata:
Categories:	KTFMB - FS
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Licences

License:	CC BY-ND 4.0, Creative Commons Attribution-NoDerivatives 4.0 International

Link:	http://creativecommons.org/licenses/by-nd/4.0/
Description:	Under the NoDerivatives Creative Commons license one can take a work released under this license and re-distribute it, but it cannot be shared with others in adapted form, and credit must be provided to the author.
Licensing start date:	29.11.2023

Secondary language

Language:	English
Title:	Blood flow modelling through an artery graft with a multiphase model of uniform fluid
Abstract:	This work describes the process of modelling blood flow through an arterial graft using a single-phase and a multiphase approach. We researched scientific articles and books on computational fluid dynamics in blood flow, described the leading equations and three approaches to modelling multiphase flow. We then used the Euler-Euler multiphase approach. For the single-phase approach, we used the Newtonian fluid model and the Nonnewtonian fluid model, while for the multiphase approach, we modelled the blood as a four-phase mixture. We performed three steady-state and one transient simulation using ANSYS Fluent 2023. The results were then analysed in CFD Post, where we focused on the wall shear stress. We found that the wall shear stress between the stent struts was lower and that there was a difference between the inner and outer walls of the artery, with the outer wall having slightly higher values of wall shear stress. We then compared our results with the scientific reference paper. We found that our single-phase approach gave better results, with the Nonnewtonian model being slightly better, while our multiphase approach differed significantly from the article. We concluded that the single-phase approach was more suitable, while the multiphase approach gave us a deeper insight into the phase or blood cell distribution. We then discussed the limitations of our multiphase approach and made suggestions for improvement.
Keywords:	Blood flow, graft, Nonnewtonian fluid, multi-phase system, numerical simulation, wall shear stress.

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