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A novel coupling algorithm for computing blood flow in viscoelastic arterial models.

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    Summary
    This summary is machine-generated.

    This study introduces a new algorithm for modeling blood flow, highlighting the crucial role of viscoelasticity in arterial walls. Accurate simulations require modeling this at all connection points, not just interior ones.

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    Area of Science:

    • Computational fluid dynamics
    • Biomedical engineering
    • Cardiovascular modeling

    Background:

    • Accurate modeling of arterial hemodynamics is essential for understanding cardiovascular diseases.
    • Existing models often simplify arterial wall properties, potentially leading to inaccuracies.

    Purpose of the Study:

    • To develop and validate a novel coupling algorithm for implementing viscoelastic wall laws in computational fluid dynamics models of the arterial system.
    • To assess the impact of applying viscoelastic models at different locations within the arterial network.

    Main Methods:

    • A novel operator-splitting coupling algorithm was developed to incorporate viscoelastic wall laws at vessel coupling nodes.
    • Two viscoelastic models (V1, V2) were tested in five computational setups, including elastic, full viscoelastic, and interior-only viscoelastic applications.
    • Simulations were performed on single artery and complete arterial tree configurations.

    Main Results:

    • Models applying viscoelasticity only at interior grid points (V1-int, V2-int) produced incorrect conclusions and significant errors.
    • Errors from interior-only models were comparable to, and at least 1/5 of, the difference between elastic and full viscoelastic models.
    • Both single artery and complete arterial tree models confirmed the necessity of including viscous components at all grid points.

    Conclusions:

    • Accurate computational modeling of arterial walls requires the implementation of viscoelastic properties at all grid points, including coupling nodes.
    • Neglecting viscoelasticity at coupling points can lead to substantial errors and flawed physiological interpretations.
    • The proposed algorithm effectively integrates viscoelasticity, improving the fidelity of cardiovascular simulations.