Work

Role of Wall Compliance and Cushioning in the Fluid-Structure Interaction Study of a High-Flow Artery

Year: 2025

Type: article

Abstract: Purpose Fluid-structure interaction (FSI) techniques have become widely accepted numerical tools for analysing transient flows through compliant channels and tubes. However, FSI remains computationally demanding and requires assumptions about certain parameters that are often difficult to determine, particularly in biomedical applications. This study aims to demonstrate the importance of key decisions required to conduct FSI simulations. Methods These include selecting appropriate material properties and setting parameters that define the magnitude of external reactions and cushioning effects (which are usually unknown but can be discovered through reverse engineering). Using a simplified model of an elastic straight tube, which represents a high-flow artery, reduced the influence of shape and associated mesh imperfections on the results. Results Wall deformation, von Mises stress, wall shear stress, and the pressure drop along the tube were analysed. Verification with various mesh densities for the compliant wall demonstrated that mesh fidelity significantly affects von Mises stress and computation time on a standard PC but has a negligible effect on wall deformation, wall shear stress, and pressure drop. Conclusions Varying wall stiffness and foundation stiffness affected the resulting compliance and all monitored parameters. Additionally, applying different mass and stiffness coefficients to define Rayleigh damping identified a safe range of applicability of this type of damping; however, experimental validation is necessary to determine appropriate values for specific applications and avoid overdamping. Finally, the results were discussed in the context of other FSI research and relevant in vivo and in vitro blood flow studies.

Source: Acta of Bioengineering and Biomechanics

DOI: 10.37190/abb/210576

Author: Daniel Mirosław Jodko

Institution: Lodz University of Technology

Language: English

Topic: Elasticity and Material Modeling

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: diamond

Funders: University of New South Wales, Narodowa Agencja Wymiany Akademickiej

Award: G4296768416