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Multidirectional WSS disturbances in stenotic turbulent flows: A pre- and post-intervention study in an aortic coarctation
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Mekanisk värmeteori och strömningslära. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0003-4656-7662
Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för kardiovaskulär medicin. Linköpings universitet, Medicinska fakulteten.ORCID-id: 0000-0003-1942-7699
Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för kardiovaskulär medicin. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Hjärt- och Medicincentrum, Fysiologiska kliniken US. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.ORCID-id: 0000-0003-1395-8296
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Mekanisk värmeteori och strömningslära. Linköpings universitet, Tekniska fakulteten. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.ORCID-id: 0000-0001-5526-2399
2017 (engelsk)Inngår i: Journal of Biomechanics, ISSN 0021-9290, E-ISSN 1873-2380, Vol. 51Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Wall shear stress (WSS) disturbances are commonly expressed at sites of abnormal flow obstructions and may play an essential role in the pathogenesis of various vascular diseases. In laminar flows these disturbances have recently been assessed by the transverse wall shear stress (transWSS), which accounts for the WSS multidirectionality. Site-specific estimations of WSS disturbances in pulsatile transitional and turbulent type of flows are more challenging due to continuous and unpredictable changes in WSS behavior. In these complex flow settings, the transWSS may serve as a more comprehensive descriptor for assessing WSS disturbances of general nature compared to commonly used parameters. In this study large eddy simulations (LES) were used to investigate the transWSS properties in flows subjected to different pathological turbulent flow conditions, governed by a patient-specific model of an aortic coarctation pre and post balloon angioplasty. Results showed that regions of strong near-wall turbulence were collocated with regions of elevated transWSS and turbulent WSS, while in more transitional-like near-wall flow regions a closer resemblance was found between transWSS and low, and oscillatory WSS. Within the frame of this study, the transWSS parameter demonstrated a more multi-featured picture of WSS disturbances when exposed to different types of flow regimes, characteristics which were not depicted by the other parameters alone. (C) 2016 Published by Elsevier Ltd.

sted, utgiver, år, opplag, sider
ELSEVIER SCI LTD , 2017. Vol. 51
Emneord [en]
Transverse wall shear stress; Turbulent kinetic energy; Large eddy simulation; Hemodynamics; Disturbed blood flow; Oscillatory shear index
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-136073DOI: 10.1016/j.jbiomech.2016.11.064ISI: 000393927500002PubMedID: 27919417OAI: oai:DiVA.org:liu-136073DiVA, id: diva2:1084786
Merknad

Funding Agencies|Center for Industrial Information Technology (CENIIT) [09.03]; Swedish National Infrastructure for Computing (SNIC) [SNIC 2014/11-22, SNIC2015/16-32]

Tilgjengelig fra: 2017-03-27 Laget: 2017-03-27 Sist oppdatert: 2017-11-29

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