Presentation Information
[MS04-03]Comparative Analysis Flow Induced Vortex Dynamics in Eccentric
Tapered and Non-Tapered Stenotic Artery
*Abhra Bhattacharyya1, Priyanshu Soni1, B.V. Rathis Kumar2, Abdullah Usmani3, Sanjay Kumar Rai1 (1. IIT(BHU) (India), 2. IIT Kanpur (India), 3. Aligarh Muslim University (India))
Keywords:
Ecccentric Tapered Stenotic Artery,Computational Fluid Dynamics,Vortex Dynamics,Von-Karman Street,Time Averaged Wall Shear Stress,Oscillatory Shear Index,Relative Residence Time
The study presents an in-silico investigation of blood flow dynamics in a tapered stenotic
artery with 100% eccentricity, comparing its hemodynamic behavior to a non-tapered,
uniform artery. Three degrees of stenosis—50%, 75%, and 90%—were analyzed using
Computational Fluid Dynamics to examine vortex dynamics and flow instabilities. The
results indicate significant vortex shedding and the formation of a von Kármán vortex street
in the post-stenotic region, with the highest shedding frequency observed in the 90% non-
tapered stenosis case. Notably, vortex dynamics were most prominent in the severe stenotic
(90% degree of stenosis) models, where intense oscillatory flow patterns developed.
However, the introduction of tapering at the distal end demonstrated a damping effect on
these vortex structures, mitigating flow instabilities. Furthermore, the study evaluated
hemodynamic parameters such as Time-Averaged Wall Shear Stress, Oscillatory Shear Index,
and Relative Residence Time, which are critical in assessing vascular wall response. The
findings suggest that in non-tapered geometries, the elevated magnitudes of these parameters
pose a significant risk of arterial wall damage, potentially leading to rupture. In contrast, the
tapered stenotic artery exhibited a reduction in these hemodynamic stressors, highlighting the
physiological relevance of tapering in minimizing adverse flow-induced forces. The study
underscores the crucial role of tapering in regulating post-stenotic vortex dynamics and
mitigating the risks associated with disturbed flow regimes.
artery with 100% eccentricity, comparing its hemodynamic behavior to a non-tapered,
uniform artery. Three degrees of stenosis—50%, 75%, and 90%—were analyzed using
Computational Fluid Dynamics to examine vortex dynamics and flow instabilities. The
results indicate significant vortex shedding and the formation of a von Kármán vortex street
in the post-stenotic region, with the highest shedding frequency observed in the 90% non-
tapered stenosis case. Notably, vortex dynamics were most prominent in the severe stenotic
(90% degree of stenosis) models, where intense oscillatory flow patterns developed.
However, the introduction of tapering at the distal end demonstrated a damping effect on
these vortex structures, mitigating flow instabilities. Furthermore, the study evaluated
hemodynamic parameters such as Time-Averaged Wall Shear Stress, Oscillatory Shear Index,
and Relative Residence Time, which are critical in assessing vascular wall response. The
findings suggest that in non-tapered geometries, the elevated magnitudes of these parameters
pose a significant risk of arterial wall damage, potentially leading to rupture. In contrast, the
tapered stenotic artery exhibited a reduction in these hemodynamic stressors, highlighting the
physiological relevance of tapering in minimizing adverse flow-induced forces. The study
underscores the crucial role of tapering in regulating post-stenotic vortex dynamics and
mitigating the risks associated with disturbed flow regimes.