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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Print: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v38.i3.30
pages 225-245

A Computational Study on the Physiologically Realistic Pulsatile Flow through an Eccentric Arterial Stenosis

A.B.M. Toufique Hasan
Department of Mechanical Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka-1000, Bangladesh
Dipak Kanti Das
Department of Mechanical Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka-1000, Bangladesh
A. K. M. Sadrul Islam
Department of Civil and Environmental Engineering, Islamic University of Technology (IUT), Board Bazar, Gazipur 1704, Bangladesh

ABSTRACT

This paper presents a computational study on the physiologically realistic pulsatile blood flow through an arterial stenosis. A semicircular eccentric stenosis is considered which is more relevant in cardiovascular system rather than the symmetric one. The degree of stenosis is varied by area from 30 to 70 %. The pulsatile flow is represented by eight harmonic components superimposed on the time-mean flow. The Reynolds number is varied from 220 to 800 during the pulsation while the Womersley number was kept constant at 6.17. Results show that the flow behaviours significantly vary during the pulse period. The vortex rings and separated shear layers are developed asymmetrically through the stenosis. The complex interaction of shear layers with vortex rings severely affects the post-stenotic areas and this becomes prominent at the end of the systolic phase compared to other times. However, the disturbances are increased with an increase of degree of stenosis. Further, various hemodynamic parameters such as wall shear stress, Wall shear stress gradient, oscillatory shear index, pressure loss and so on are discussed in this paper.