Key result
Computational models of stenotic elastic arteries show no difference in vortical flow versus rigid models.
Why the study?
The oscillatory nature of wall shear stress in pulsatile flow through compliant stenotic vessels and its interaction with vessel wall dynamics requires detailed computational modeling.
This computational model demonstrates that fluid-wall interactions in a stenotic elastic artery do not significantly alter vortical flow development compared to a rigid model.
Rigid-wall models suffice for vortical flow in this stenotic setting; leaves open validation across patient-specific geometries and pulsatile conditions.
This paper studies the oscillatory nature of wall shear stress as a result of a pulsatile flow and periodically excited wall. An unsteady Navier-Stokes (N-S) solver based on the method of operator splitting and artificial compressibility has been developed for the moving boundary problem to simulate blood flow through a compliant vessel. The code of the solver has been developed using Fasttalk, a high-level programming language in the Fastflo environment. Galerkin finite elements are used to discretise the governing equations. The analysis has been applied to the backward facing step and a time varying computational domain (2-D tube) as test cases for validation. The code is then applied to a physiologically realistic blood vessel based on the spring and dashpot model. The governing equation for the blood vessel is based on 2-D dynamic thin shell theory that takes into account the curvature of the stenotic portion of the vessel. Marching the solution towards steady state is considered to show the viability of the current technique. Several sample cases are presented with emphasis on the depiction of vortical flow details and wall shear stress. There has been no observable difference in vortical flow development when compared with the rigid stenotic model.
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Ng et al. (2002) studied Stenotic elastic artery (computational model). Computational modeling of fluid-wall interactions vs. Rigid stenotic model was evaluated on Vortical flow details and wall shear stress. A computational model of fluid-wall interactions in a stenotic elastic artery showed no observable difference in vortical flow development when compared with a rigid stenotic model.
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