A method for partitioned fluid-structure interaction computation of flow in arteries.

Area of Science:

• Computational fluid dynamics
• Biomedical engineering
• Fluid-structure interaction

Background:

• Fluid-structure interaction (FSI) simulations are crucial for understanding blood flow in elastic arteries.
• Existing artificial compressibility method (ACM) coupled with FSI has limitations in stabilizing iterative coupling.

Purpose of the Study:

• To introduce and validate a new test load method for improving ACM/FSI computations.
• To enhance the robustness and convergence of blood flow simulations in elastic arteries.

Main Methods:

• Application of the artificial compressibility method (ACM) for strongly coupled FSI.
• Introduction of a novel test load method where the compressibility parameter is computed locally based on mesh deformation.
• Demonstration using arterial flow simulations and combination with 1D FSI models for physiological relevance.

Main Results:

• The test load method significantly improves ACM/FSI computations.
• Robust convergence was achieved in the arterial flow simulation.
• The combined approach enhances physiological relevance by integrating 1D and higher-dimensional models.

Conclusions:

• The test load method offers a robust and effective enhancement for ACM/FSI simulations.
• This improved method provides more accurate and stable simulations of blood flow in elastic arteries.
• The study contributes to more physiologically relevant computational models for cardiovascular research.