Session HL: Biofluids: Physiological Circulatory II
10:30 AM–12:27 PM, Monday, November 22, 2010
Long Beach Convention Center Room: 202A
Chair: Petia Vlahovska, Brown University
Abstract ID: BAPS.2010.DFD.HL.2
Abstract: HL.00002 : Secondary flow structure from stent-induced perturbations in a bent pipe model for curved arteries
10:43 AM–10:56 AM
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Abstract 
Authors:
Fangjun Shu
(George Washington University)
Autumn Glenn
(George Washington University)
Kartik Bulusu
(George Washington University)
Michael W. Plesniak
(George Washington University)
Secondary flow structures were investigated in a 180-degree circular bend under physiological (pulsatile) flow conditions with a stent model installed upstream of the bend. Upstream Reynolds number ranged from 200 to 1400 and the cardiac cycle period was scaled to match the physiological Womersley number, Wo=4.2. Experimental data were acquired using 2-D PIV at various cross-sectional planes along the bend. Similar to the results in absence of the stent model, symmetric counter-rotating vortex pairs were observed to develop during the cardiac cycle. In addition, transient unstable flow was initiated at the deceleration phase of the systolic peak (t/T=0.21). This complex flow is mainly attributable to perturbations induced by the stent model. It is characterized by breakdown of Dean- and Lyne-type vortices into various multiple-scale vortices. The phase-averaged flow fields were analyzed using the proper orthogonal decomposition (POD) method to gain further insight regarding the structural features of the flow.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.DFD.HL.2