Oscillatory and pulsatile flows of Newtonian fluids in straight elastic tubes are simulated numerically with the aid of Ling and Atabek’s “local flow” assumption for the nonlinear convective acceleration terms. For the first time, a theoretical assessment of the local flow assumption is presented, and the range of validity of the assumption is estimated by comparison with perturbation solutions of the complete flow problem. Subsequent simulations with the local flow model indicate that the flow field and associated wall shear stress are extremely sensitive to the phase angle between oscillatory pressure and flow waves (impedance phase angle). This phase angle, which is a measure of the wave reflection present in the system, is known to be altered by arterial disease (e.g., hypertension) and vasoactive drugs. Thus, the paper elucidates a mechanism by which subtle changes in systemic hemodynamics (i.e., phase angles) can markedly influence local wall shear stress values.
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February 1992
Research Papers
Numerical Analysis of Flow in an Elastic Artery Model
A. Dutta,
A. Dutta
Department of Chemical Engineering, The Pennsylvania State University, University Park, PA 16802
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D. M. Wang,
D. M. Wang
Department of Chemical Engineering, The Pennsylvania State University, University Park, PA 16802
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J. M. Tarbell
J. M. Tarbell
Department of Chemical Engineering, The Pennsylvania State University, University Park, PA 16802
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A. Dutta
Department of Chemical Engineering, The Pennsylvania State University, University Park, PA 16802
D. M. Wang
Department of Chemical Engineering, The Pennsylvania State University, University Park, PA 16802
J. M. Tarbell
Department of Chemical Engineering, The Pennsylvania State University, University Park, PA 16802
J Biomech Eng. Feb 1992, 114(1): 26-33 (8 pages)
Published Online: February 1, 1992
Article history
Received:
August 6, 1991
Revised:
September 30, 1991
Online:
March 17, 2008
Citation
Dutta, A., Wang, D. M., and Tarbell, J. M. (February 1, 1992). "Numerical Analysis of Flow in an Elastic Artery Model." ASME. J Biomech Eng. February 1992; 114(1): 26–33. https://doi.org/10.1115/1.2895444
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