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Related Experiment Videos

Hemodynamics in aneurysm

B V Kumar1, K B Naidu

  • 1Department of Mathematics & Scientific Computing, Indian Institute of Technology, Kanpur, U.P.-India.

Computers and Biomedical Research, an International Journal
|April 1, 1996
PubMed
Summary
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This study simulates blood flow in dilated vessels, revealing how aneurysms significantly alter hemodynamics. Key findings highlight the impact of vessel dilation on flow patterns and pressures.

Area of Science:

  • Biomedical Engineering
  • Computational Fluid Dynamics
  • Medical Physics

Background:

  • Hemodynamics in blood vessels is crucial for understanding cardiovascular health.
  • Vessel dilation, such as in aneurysms, can significantly alter blood flow dynamics.
  • Accurate simulation of pulsatile flow in non-linear geometries is computationally challenging.

Purpose of the Study:

  • To numerically simulate hemodynamics in blood vessels with varying degrees of dilation (0-75%).
  • To analyze the influence of aneurysm presence and dilation percentage on flow, pressure, and stress fields.
  • To investigate the significance of nonlinear terms and vessel geometry in pulsatile flow.

Main Methods:

  • Utilized a transient Unsteady Viscous Plastic (UVP) finite element method (FEM).

Related Experiment Videos

  • Employed a stable time integration scheme with a predictor-corrector strategy and constant error monitoring.
  • Analyzed pulsatile flow without assumptions in nonlinear terms, focusing on flow, pressure, and stress fields.

    • Main Results:

    • Aneurysm presence influences central axis velocity, central axis and wall pressures, pressure gradient, and wall shear stress.
    • Time-dependent recirculation regions were observed, sensitive to the degree of vessel dilation.
    • Transverse velocities and their temporal variations were found to be significant and non-negligible.
    • Nonlinear convective terms and vessel geometry effects were evident in transverse velocity and pressure profiles.

    Conclusions:

    • Vessel dilation significantly impacts hemodynamic parameters, including velocity, pressure, and wall shear stress.
    • Recirculation zones form within dilated segments, with their characteristics dependent on the dilation extent.
    • Transverse flow components and nonlinear effects are critical for accurate hemodynamic simulations in aneurysmal conditions.