The Effect of Asymmetry in Abdominal Aortic Aneurysms Under Physiologically Realistic Pulsatile Flow Conditions

E. A. Finol; K. Keyhani; C. H. Amon

doi:10.1115/1.1543991

Journal of Biomechanical Engineering | Volume 125 | Issue 2 | TECHNICAL PAPERS

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TECHNICAL PAPERS: Fluids/Heat/Transport

The Effect of Asymmetry in Abdominal Aortic Aneurysms Under Physiologically Realistic Pulsatile Flow Conditions

E. A. Finol, ASME Member, Research Assistant Professor, K. Keyhani, Staff Engineer and C. H. Amon, ASME Life Fellow, Raymond J. Lane Distinguished Professor

[+] Author and Article Information

E. A. Finol

Institute for Complex Engineered Systems, Faculty, Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213

K. Keyhani

Research and Development, Asyst Technologies, Fremont, CA 94538

C. H. Amon

Mechanical Engineering, Biomedical Engineering, and Institute for Complex Engineered Systems, Carnegie Mellon University, Pittsburgh, PA 15213

J Biomech Eng 125(2), 207-217 (Apr 09, 2003) (11 pages) doi:10.1115/1.1543991 History: Received February 01, 2002; Revised November 01, 2002; Online April 09, 2003

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Finite element discretization of three-dimensional AAA models, for which d=1.6 cm, D=3d, L=6d, and L_T=9.4d. A varying degree of asymmetry is considered for model #1-β=1.0 (axisymmetric), model #2-β=0.8,[[ellipsis]], model #5-β=0.3.

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Pulsatile volumetric flow rate (Q) and instantaneous Reynolds number (Re) for Re_m=300. Peak systolic flow occurs at t=0.31 s and diastolic phase begins at t=0.52 s. Flow phases (1) to (4) are described in the Flow Dynamics section.

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Schematic of the transverse (x-z) and medial (y-z) planes used to evaluate the velocity field

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Velocity vectors for Re_m=300 in model #1 (β=1.0) at different stages of the cardiac cycle (t=0.20, 0.30, 0.42, 0.52 and 1.00 s) for the (a) x-z plane and (b) y-z plane

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Velocity vectors for Re_m=300 in model #5 (β=0.3) at different stages of the cardiac cycle (t=0.20, 0.30, 0.42, 0.52 and 1.00 s) for the (a) x-z plane and (b) y-z plane

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Cross-streamwise velocity vectors for Re_m=300 at the proximal end, midsection and distal end of model #5 (β=0.3); (a) location of selected cross-sections, (b) vectors for t=0.20 s and (c) vectors for t=1.00 s

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Wall pressure surface distributions for Re_m=300 at t=0.29 s in (a) model #1-β=1.0, (b) model #3-β=0.6 and (c) model #5-β=0.3.

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Wall shear stress surface distributions for Re_m=300 at t=0.20 s in (a) model #1-β=1.0, (b) model #3-β=0.6 and (c) model #5-β=0.3

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Wall shear stress surface distributions for Re_m=300 at t=0.30 s in (a) model #1-β=1.0, (b) model #3-β=0.6 and (c) model #5-β=0.3

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Dependence of maximum wall shear stress on (a) time-average Reynolds number and (b) asymmetry parameter, at peak flow

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Finol EA, Keyhani KK, Amon CH. The Effect of Asymmetry in Abdominal Aortic Aneurysms Under Physiologically Realistic Pulsatile Flow Conditions. ASME. J Biomech Eng. 2003;125(2):207-217. doi:10.1115/1.1543991.

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The Effect of Asymmetry in Abdominal Aortic Aneurysms Under Physiologically Realistic Pulsatile Flow Conditions

References

Figures

Finite element discretization of three-dimensional AAA models, for which d=1.6 cm, D=3d, L=6d, and L_T=9.4d. A varying degree of asymmetry is considered for model #1-β=1.0 (axisymmetric), model #2-β=0.8,[[ellipsis]], model #5-β=0.3.

Pulsatile volumetric flow rate (Q) and instantaneous Reynolds number (Re) for Re_m=300. Peak systolic flow occurs at t=0.31 s and diastolic phase begins at t=0.52 s. Flow phases (1) to (4) are described in the Flow Dynamics section.

Schematic of the transverse (x-z) and medial (y-z) planes used to evaluate the velocity field

Velocity vectors for Re_m=300 in model #1 (β=1.0) at different stages of the cardiac cycle (t=0.20, 0.30, 0.42, 0.52 and 1.00 s) for the (a) x-z plane and (b) y-z plane

Velocity vectors for Re_m=300 in model #5 (β=0.3) at different stages of the cardiac cycle (t=0.20, 0.30, 0.42, 0.52 and 1.00 s) for the (a) x-z plane and (b) y-z plane

Cross-streamwise velocity vectors for Re_m=300 at the proximal end, midsection and distal end of model #5 (β=0.3); (a) location of selected cross-sections, (b) vectors for t=0.20 s and (c) vectors for t=1.00 s

Wall pressure surface distributions for Re_m=300 at t=0.29 s in (a) model #1-β=1.0, (b) model #3-β=0.6 and (c) model #5-β=0.3.

Wall shear stress surface distributions for Re_m=300 at t=0.20 s in (a) model #1-β=1.0, (b) model #3-β=0.6 and (c) model #5-β=0.3

Wall shear stress surface distributions for Re_m=300 at t=0.30 s in (a) model #1-β=1.0, (b) model #3-β=0.6 and (c) model #5-β=0.3

Dependence of maximum wall shear stress on (a) time-average Reynolds number and (b) asymmetry parameter, at peak flow

Tables

Errata

Discussions

Related Content

Journals

Conference Proceedings

eBooks

The Effect of Asymmetry in Abdominal Aortic Aneurysms Under Physiologically Realistic Pulsatile Flow Conditions

References

Figures

Finite element discretization of three-dimensional AAA models, for which d=1.6 cm, D=3d, L=6d, and LT=9.4d. A varying degree of asymmetry is considered for model #1-β=1.0 (axisymmetric), model #2-β=0.8,[[ellipsis]], model #5-β=0.3.

Pulsatile volumetric flow rate (Q) and instantaneous Reynolds number (Re) for Rem=300. Peak systolic flow occurs at t=0.31 s and diastolic phase begins at t=0.52 s. Flow phases (1) to (4) are described in the Flow Dynamics section.

Schematic of the transverse (x-z) and medial (y-z) planes used to evaluate the velocity field

Velocity vectors for Rem=300 in model #1 (β=1.0) at different stages of the cardiac cycle (t=0.20, 0.30, 0.42, 0.52 and 1.00 s) for the (a) x-z plane and (b) y-z plane

Velocity vectors for Rem=300 in model #5 (β=0.3) at different stages of the cardiac cycle (t=0.20, 0.30, 0.42, 0.52 and 1.00 s) for the (a) x-z plane and (b) y-z plane

Cross-streamwise velocity vectors for Rem=300 at the proximal end, midsection and distal end of model #5 (β=0.3); (a) location of selected cross-sections, (b) vectors for t=0.20 s and (c) vectors for t=1.00 s

Wall pressure surface distributions for Rem=300 at t=0.29 s in (a) model #1-β=1.0, (b) model #3-β=0.6 and (c) model #5-β=0.3.

Wall shear stress surface distributions for Rem=300 at t=0.20 s in (a) model #1-β=1.0, (b) model #3-β=0.6 and (c) model #5-β=0.3

Wall shear stress surface distributions for Rem=300 at t=0.30 s in (a) model #1-β=1.0, (b) model #3-β=0.6 and (c) model #5-β=0.3

Dependence of maximum wall shear stress on (a) time-average Reynolds number and (b) asymmetry parameter, at peak flow

Tables

Errata

Discussions

Related Content

Journals

Conference Proceedings

eBooks

Finite element discretization of three-dimensional AAA models, for which d=1.6 cm, D=3d, L=6d, and L_T=9.4d. A varying degree of asymmetry is considered for model #1-β=1.0 (axisymmetric), model #2-β=0.8,[[ellipsis]], model #5-β=0.3.

Pulsatile volumetric flow rate (Q) and instantaneous Reynolds number (Re) for Re_m=300. Peak systolic flow occurs at t=0.31 s and diastolic phase begins at t=0.52 s. Flow phases (1) to (4) are described in the Flow Dynamics section.

Velocity vectors for Re_m=300 in model #1 (β=1.0) at different stages of the cardiac cycle (t=0.20, 0.30, 0.42, 0.52 and 1.00 s) for the (a) x-z plane and (b) y-z plane

Velocity vectors for Re_m=300 in model #5 (β=0.3) at different stages of the cardiac cycle (t=0.20, 0.30, 0.42, 0.52 and 1.00 s) for the (a) x-z plane and (b) y-z plane

Cross-streamwise velocity vectors for Re_m=300 at the proximal end, midsection and distal end of model #5 (β=0.3); (a) location of selected cross-sections, (b) vectors for t=0.20 s and (c) vectors for t=1.00 s

Wall pressure surface distributions for Re_m=300 at t=0.29 s in (a) model #1-β=1.0, (b) model #3-β=0.6 and (c) model #5-β=0.3.

Wall shear stress surface distributions for Re_m=300 at t=0.20 s in (a) model #1-β=1.0, (b) model #3-β=0.6 and (c) model #5-β=0.3

Wall shear stress surface distributions for Re_m=300 at t=0.30 s in (a) model #1-β=1.0, (b) model #3-β=0.6 and (c) model #5-β=0.3