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Modeling rough stenoses by an immersed-boundary method.

Alexander Yakhot1, Leopold Grinberg, Nikolai Nikitin

  • 1Department of Mechanical Engineering, The Pearlstone Center for Aeronautical Engineering Studies, Ben-Gurion University of the Negev, Beersheva 84105, Israel.

Journal of Biomechanics
|March 31, 2005
PubMed
Summary
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Surface irregularities on stenosed arteries do not significantly impact flow resistance. However, the immersed-boundary method accurately captures near-wall effects like fluid recirculation for detailed flow pattern analysis.

Area of Science:

  • Fluid dynamics
  • Biomedical engineering
  • Computational science

Background:

  • Stenosed arteries pose significant cardiovascular risks.
  • Accurate simulation of blood flow is crucial for understanding disease progression.
  • Previous models often simplified arterial geometry, neglecting surface details.

Purpose of the Study:

  • To simulate pulsatile laminar flow in a stenosed artery using an immersed-boundary method.
  • To investigate the influence of surface roughness on flow resistance.
  • To analyze near-wall flow phenomena in realistic arterial geometries.

Main Methods:

  • Simulated pulsatile laminar flow of a viscous, incompressible fluid.
  • Employed an immersed-boundary method for complex geometry simulation.

Related Experiment Videos

  • Validated numerical results against experimental and published data.

    • Main Results:

    • Surface irregularities showed no significant effect on overall flow resistance within physiological Reynolds numbers.
    • The immersed-boundary method accurately represented complex geometries and surface details.
    • Fluid recirculation and near-wall effects were successfully investigated.

    Conclusions:

    • Surface roughness is not a primary determinant of flow resistance in stenosed arteries at physiological conditions.
    • The immersed-boundary method is effective for detailed analysis of near-wall flow patterns in complex arterial models.
    • Accurate geometric representation is key for studying realistic flow phenomena.