AI Article Synopsis
- The study examines how blood vessel collapse occurs in various health conditions by simulating fluid flow through a rigid channel that includes a flexible beam.
- Using advanced computational methods, the research analyzes the interaction between the fluid dynamics and the elastic beam's motion, particularly focusing on factors that affect oscillations and collapses.
- Key findings reveal that applying external pressure triggers oscillations in the beam, with significant changes in blood pressure and wall shear stress occurring around the area of greatest deformation.
Article Abstract
Motivated by collapse of blood vessels for both healthy and diseased situations under various circumstances in human body, we have performed computational studies on an incompressible viscous fluid past a rigid channel with part of its upper wall being replaced by a deformable beam. The Navier-Stokes equations governing the fluid flow are solved by a multi-block lattice Boltzmann method and the structural equation governing the elastic beam motion by a finite difference method. The mutual coupling of the fluid and solid is realized by the momentum exchange scheme. The present study focuses on the influences of the dimensionless parameters controlling the fluid-structure system on the collapse and self-excited oscillation of the beam and fluid dynamics downstream. The major conclusions obtained in this study are described as follows. The self-excited oscillation can be intrigued by application of an external pressure on the elastic portion of the channel and the part of the beam having the largest deformation tends to occur always towards the end portion of the deformable wall. The blood pressure and wall shear stress undergo significant variations near the portion of the greatest oscillation. The stretching motion has the most contribution to the total potential elastic energy of the oscillating beam.
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| http://dx.doi.org/10.1016/j.jbiomech.2015.04.011 | DOI Listing |
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