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Apparent stresses in disturbed pulsatile flows.

B B Lieber1, D P Giddens

  • 1Department of Mechanical and Aerospace Engineering, State University of New York, Buffalo 14260.

Journal of Biomechanics
|January 1, 1988
PubMed
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Analyzing pulsatile flow in arteries, this study reveals traditional methods underestimate apparent stress. A frequency domain approach better captures both random and coherent disturbances for accurate stress estimation in human carotid artery models.

Area of Science:

  • Fluid dynamics
  • Biomedical engineering
  • Hemodynamics

Background:

  • Pulsatile flow in arteries, particularly the carotid artery, exhibits complex transitional phenomena.
  • Accurate characterization of blood flow dynamics is crucial for understanding cardiovascular health.
  • Traditional methods for decomposing velocity into repeatable and random components have limitations.

Purpose of the Study:

  • To examine traditional velocity decomposition methods under pulsatile flow conditions.
  • To investigate the impact of decomposition methods on the computation of apparent stresses.
  • To propose an improved method for stress estimation in arterial flows.

Main Methods:

  • Analysis of velocity data from a 90% axisymmetric constriction model.

Related Experiment Videos

  • Comparison of traditional ensemble averaging with a frequency domain decomposition approach.
  • Examination of Reynolds stresses under transitional flow regimes.

    • Main Results:

    • Traditional ensemble averaging underestimates apparent stress when coherent disturbances are present.
    • Transitional phenomena occur during portions of the pulsatile cycle at relevant Reynolds numbers.
    • The frequency domain approach integrates random and coherent stresses into a single apparent stress.

    Conclusions:

    • The choice of velocity decomposition method significantly impacts apparent stress calculations in pulsatile arterial flows.
    • Traditional ensemble averaging is insufficient for accurately quantifying stresses in the presence of coherent disturbances.
    • A frequency domain approach offers a more comprehensive method for estimating fluctuating stresses in arterial flows.