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This contribution presents a computational comparison and cross-validation of a coupled fluid-structure interaction (FSI) model considering an oscillatory (direction reversing) flow of an incompressible fluid in a partially elastic channel. The solution of a full 2D FSI model solved by a finite-element method (FEM) is compared with a simplified coupled 2D-1D model solved by finite difference method (FDM). Besides providing a direct comparison of instantaneous velocity profiles with the Womersley analytical solution in the rigid part of the channel, the data from the elastic part considering fluid-structure interaction are compared as well. The results show a good mutual agreement of both models, with obvious limitations in the elastic region, where the computational setups for both models can’t be exactly identical.

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Comparative Study of 2D-2D FEM-FSI and 2D-1D Reduced FD Models for Respiratory Flow Simulation

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  • 发表日期：

    2025年

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  • Anna Lancmanová,
  • Alexander Drobny,
  • Elfriede Friedmann,
  • Tomáš Bodnár

摘要

This contribution presents a computational comparison and cross-validation of a coupled fluid-structure interaction (FSI) model considering an oscillatory (direction reversing) flow of an incompressible fluid in a partially elastic channel. The solution of a full 2D FSI model solved by a finite-element method (FEM) is compared with a simplified coupled 2D-1D model solved by finite difference method (FDM). Besides providing a direct comparison of instantaneous velocity profiles with the Womersley analytical solution in the rigid part of the channel, the data from the elastic part considering fluid-structure interaction are compared as well. The results show a good mutual agreement of both models, with obvious limitations in the elastic region, where the computational setups for both models can’t be exactly identical.