Prediction of vortex structures in pulsatile flow through S-bend arterial geometry with different stenosis levels

Khan, Piru Mohan; Raj, Apurva; Alam, Irshad; Chakraborty, Suman; Roy, Somnath

doi:10.1016/j.bbe.2023.01.003

Cited by 17 publications

(4 citation statements)

References 41 publications

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“…Results from the present study are found to be contrasting with the OSI distribution reported by Khan et al (2023). Khan et al (2023) noticed maximum OSI on the wall on the same side of stenosis. Changing the severity of the second blockage to 60% elongates the recirculation zone further downstream, as shown in Figure 18(b).…”

Section: Oscillatory Shear Indexcontrasting

confidence: 99%

“…The resemblance also extends on opposite wall of stenosis (side on which less blockage is present) and far downstream of the blockage, where high flow fluctuations are present. Results from the present study are found to be contrasting with the OSI distribution reported by Khan et al (2023). Khan et al (2023) noticed maximum OSI on the wall on the same side of stenosis.…”

Section: Oscillatory Shear Indexcontrasting

confidence: 99%

“…Ding et al (2021) observed more fluctuations in WSS at two different locations downstream of the eccentric stenosis, one immediately after the stenosis on the blocked side (side on which blockage is present) and the other even more downstream in recirculation zone on the non-blocked side (side on which blockage is absent). Khan et al (2023) observed contrasting OSI distribution, which was reported earlier by Ding et al (2021). Timofeeva et al (2022) observed the uneven distribution of OSI in eccentric cases, and it appeared to be higher on the blocked side in the downstream of stenosis.…”

Section: Introductionmentioning

confidence: 47%

“…At peak flow rate corresponding to phase P 2 , roll up of shear layer becomes inevitable for interspacing values of 6D and 8D, which is otherwise avoided for short interspacing of 4D. Khan et al (2023) have also reported such instabilities at peak flow rates in the flow downstream of severe blockages. Figure 8 shows the flow instabilities with the help of pressure variation along flow direction at phase P 2 .…”

Section: Vortical Structuresmentioning

confidence: 94%

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Numerical simulation of pulsatile blood flow through eccentric double stenosed carotid artery

Rajmane,

Tiwari

2023

HFF

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Purpose This study aims to perform three-dimensional numerical computations for blood flow through a double stenosed carotid artery. Pulsatile flow with Womersley number (Wo) of 4.65 and Reynolds number (Re) of 425, based on the diameter of normal artery and average velocity of inlet pulse, was considered. Design/methodology/approach Finite volume method based ANSYS Fluent 20.1 was used for solving the governing equations of three-dimensional, laminar, incompressible and non-Newtonian blood flow. A high-quality grid with sufficient refinement was generated using ICEM CFD 20.1. The time-averaged flow field was captured to investigate the effect of severity and eccentricity on the lumen flow characteristics. Findings The results show that an increase in interspacing between blockages brings shear layer instability within the region between two blockages. The velocity profile and wall shear stress distribution are found to be majorly influenced by eccentricity. On the other hand, their peak magnitude is found to be primarily influenced by severity. Results have also demonstrated that the presence of eccentricity in stenosis would assist in flow development. Originality/value Variation in severity and interspacing was considered with a provision of eccentricity equal to 10% of diameter. Eccentricity refers to the offset between the centreline of stenosis and the centreline of normal artery. For the two blockages, severity values of 40% and 60% based on diameter reduction were permuted, giving rise to four combinations. For each combination, three values of interspacing in the multiples of normal artery diameter (D), viz. 4D, 6D and 8D were considered.

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Section: Oscillatory Shear Indexcontrasting

confidence: 99%

Section: Oscillatory Shear Indexcontrasting

confidence: 99%