Flow effects of blood constitutive equations in 3D models of vascular anomalies

Neofytou, P; Tsangaris, S

dc.contributor.author	Neofytou, P	en
dc.contributor.author	Tsangaris, S	en
dc.date.accessioned	2014-03-01T01:24:25Z
dc.date.available	2014-03-01T01:24:25Z
dc.date.issued	2006	en
dc.identifier.issn	0271-2091	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17253
dc.subject	haemodynamics	en
dc.subject	CFD	en
dc.subject	blood constitutive equations	en
dc.subject	stenosis	en
dc.subject	abdominal aortic aneurysm	en
dc.subject.classification	Computer Science, Interdisciplinary Applications	en
dc.subject.classification	Mathematics, Interdisciplinary Applications	en
dc.subject.classification	Mechanics	en
dc.subject.classification	Physics, Fluids & Plasmas	en
dc.subject.other	ABDOMINAL AORTIC-ANEURYSMS	en
dc.subject.other	PULSATILE FLOW	en
dc.subject.other	ARTERIAL-STENOSIS	en
dc.subject.other	STEADY FLOW	en
dc.subject.other	SIMULATION	en
dc.subject.other	HEMODYNAMICS	en
dc.subject.other	RHEOLOGY	en
dc.title	Flow effects of blood constitutive equations in 3D models of vascular anomalies	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/fld.1124	en
heal.identifier.secondary	http://dx.doi.org/10.1002/fld.1124	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	The effects of different blood rheological models are investigated numerically utilizing two three-dimensional (3D) models of vascular anomalies, namely a stenosis and an abdominal aortic aneurysm model. The employed CFD code incorporates the SIMPLE scheme in conjunction with the finite-volume method with collocated arrangement of variables. The approximation of the convection terms is carried out using the QUICK differencing scheme, whereas the code enables also multi-block computations, which are useful in order to cope with the two-block grid structure of the current computational domain. Three non-Newtonian models are employed, namely the Casson, Power-Law and Quemada models, which have been introduced in the past for modelling the rheological behaviour of blood and cover both the viscous as well as the two-phase character of blood. In view of the haemodynamical mechanisms related to abnormalities in the vascular network and the role of the wall shear stress in initiating and further developing of arterial diseases, the present study focuses on the 3D flow field and in particular on the distribution as well as on both low and high values of the wall shear stress in the vicinity of the anomaly. Finally, a comparison is made between the effects of each rheological model on the aforementioned parameters. Results show marked differences between simulating blood as Newtonian and non-Newtonian fluid and furthermore the Power-Law model exhibits different behaviour in all cases compared to the other models whereas Quernada and Casson models exhibit similar behaviour in the case of the stenosis but different behaviour in the case of the aneurysm. Copyright (c) 2005 John Wiley & Sons, Ltd.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS	en
dc.identifier.doi	10.1002/fld.1124	en
dc.identifier.isi	ISI:000237820600002	en
dc.identifier.volume	51	en
dc.identifier.issue	5	en
dc.identifier.spage	489	en
dc.identifier.epage	510	en