Key result
Numerical FSI simulations of fluid flow in a flexible silicone tube showed relatively good agreement with experimental velocity profiles during inflation, but deviations increased during contraction.
Why the study?
Fluid flow in flexible-walled pipes models blood flow in human arteries or their substitutes, requiring experimental and computational study of the phenomenon.
FSI simulations can approximate fluid flow in flexible tubes like arteries, but experimental validation highlights challenges with dynamic deformations and material non-uniformities.
Experimental PDMS models support FSI validation in flexible tubes; leaves open translation to anisotropic human arteries.
Presented paper is focused on the experimental and computational study of fluid flow in pipes with flexible walls. One possible real example of this phenomenon is the blood flow in arteries or their substitutes in the human body. The artery material itself should be understood as anisotropic and heterogeneous. Therefore, the experiment was carried out on the deforming tube, made of silicone (polydimethylsiloxane - PDMS). Obtained results and observed events were verified by numerical FSI simulations. Due to the large deformations occurring during loading of the tube, it was necessary to work with a dynamic mesh in the CFD part. Based on experimental testing of the tube material, a non-Hookean and Mooney-Rivlin material model were considered. Blood flowing in vessels is a heterogeneous liquid and exhibits non-Newtonian properties. In the real experimental stand has been somewhat simplified. Water, chosen as the liquid, belongs to the Newtonian liquids. The results show mainly comparisons of unsteady velocity profiles between the experiment and the numerical model.
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Šedivý et al. (2020) studied Fluid flow in flexible tubes (simulating blood flow in arteries). Fluid-Structure Interaction (FSI) simulation vs. Particle Image Velocimetry (PIV) experiment was evaluated on Unsteady velocity profiles and mean cross-sectional velocity. Numerical FSI simulations of fluid flow in a flexible silicone tube showed relatively good agreement with experimental velocity profiles during inflation, but deviations increased during contraction.
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