Abstract：
:The arteriovenous junction is characterised by high flow rates, large pressure difference and typically a palpable thrill or audible bruit, associated with turbulent flow. However, the arteriovenous junction is frequently studied with the assumption of streamline flow. This assumption is based on the Reynolds number calculation, although other factors can contribute to turbulent generation. In this study, the presence of instabilities is examined and the influencing factors discussed. This was performed using a pseudo-realistic geometry with adapted graft angles, vein diameter, outflow split ratio and graft inlet velocity values. Correlation was performed between steady and unsteady averaged simulation cases with correlation performance ranked. Overall the arteriovenous junction is capable of possessing highly disturbed flows, in which strict modelling requirements are necessary to capture such instabilities and avoid erroneous conclusions. Vein diameter and flow split ratio contribute to turbulent generation, thus Reynolds number cannot be used as a sole turbulent criterion in the arteriovenous junction.
journal_name
J Biomechjournal_title
Journal of biomechanicsauthors
Broderick SP,Houston JG,Walsh MTdoi
10.1016/j.jbiomech.2015.07.038subject
Has Abstractpub_date
2015-10-15 00:00:00pages
3591-8issue
13eissn
0021-9290issn
1873-2380pii
S0021-9290(15)00432-7journal_volume
48pub_type
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