Artery Research

Volume 6, Issue 4, December 2012, Pages 164 - 165

P2.05 INVESTIGATION OF FLOW AND WALL SHEAR STRESS DURING PULSATILE FLOW IN A HUMAN AORTA WITH A COARCTATION AND POST-STENOTIC DILATATION USING LARGE EDDY SIMULATIONS

Authors
R. Gårdhagen, M. Karlsson
Linköping University, Linköping, Sweden
Available Online 17 November 2012.
DOI
10.1016/j.artres.2012.09.086How to use a DOI?
Open Access
This is an open access article distributed under the CC BY-NC license.

Flow field and wall shear stress (WSS) in an idealized model of a human aorta with a coarctation and a post-stenotic dilatation, Figure 1, were investigated with large eddy simulation. A physiologic pulse was prescribed at the inlet, Figure 1. Phase averages of axial WSS, from 30 consecutive pulses, were determined between the throat (x=0) and the exit (x=0.2 m) along lines where the x-y plane and x-z plane cross the vessel wall. Figure 2 shows these values at late systole; the pattern is representative for the entire systolic phase. WSS peaks in the stenosis, as expected, but also at the end of the dilatation (x=0.06 m). In the dilatation backflow causes a negative peak. Diastolic WSS is characterised by low amplitude oscillations. Also noticeable is the asymmetric pattern between the inner (y>0) and outer (y<0) sides caused by the flow through the arch. Thus, large spatial, temporal, and probably asymmetric WSS gradients in the already diseased region suggest increased risk for further endothelial dysfunction [1]. This reflects a complex, partly turbulent, flow pattern that may disturb the blood flow in the abdominal aorta.

Figure 1

Geometry with flow direction and inlet pulse profile.

Figure 2

Phase averaged axial WSS along four lines between the throat (x=0) and the exit (x=0.2 m).

Journal
Artery Research
Volume-Issue
6 - 4
Pages
164 - 165
Publication Date
2012/11/17
ISSN (Online)
1876-4401
ISSN (Print)
1872-9312
DOI
10.1016/j.artres.2012.09.086How to use a DOI?
Open Access
This is an open access article distributed under the CC BY-NC license.

Cite this article

TY  - JOUR
AU  - R. Gårdhagen
AU  - M. Karlsson
PY  - 2012
DA  - 2012/11/17
TI  - P2.05 INVESTIGATION OF FLOW AND WALL SHEAR STRESS DURING PULSATILE FLOW IN A HUMAN AORTA WITH A COARCTATION AND POST-STENOTIC DILATATION USING LARGE EDDY SIMULATIONS
JO  - Artery Research
SP  - 164
EP  - 165
VL  - 6
IS  - 4
SN  - 1876-4401
UR  - https://doi.org/10.1016/j.artres.2012.09.086
DO  - 10.1016/j.artres.2012.09.086
ID  - Gårdhagen2012
ER  -