Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Numerical Analysis of Transitional Flow in a Stenosed Carotid Artery

협착된 경동맥내 천이 유동 수치 해석

  • Kim, Dongmin (School of Mechanical Engineering, Pusan National University) ;
  • Hwang, Jinyul (School of Mechanical Engineering, Pusan National University) ;
  • Min, Too-Jae (Department of Anesthesiology and Pain Medicine, Korea University Ansan Hospital, Korea University College of Medicine) ;
  • Jo, Won-Min (Department of Thoracic & Cardiovascular Surgery, Korea University Ansan Hospital, Korea University College of Medicine)
  • Received : 2022.03.03
  • Accepted : 2022.03.28
  • Published : 2022.03.31
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Abstract

Direct numerical simulation of blood flow in a stenosed, patient-specific carotid artery was conducted to explore the transient behavior of blood flow with special emphasis on the wall-shear stress distribution over the transition region. We assumed the blood as an incompressible Newtonian fluid, and the vessel was treated as a solid wall. The pulsatile boundary condition was applied at the inlet of the carotid. The Reynolds number is 884 based on the inlet diameter, and the maximum flow rate and the corresponding Womersley number is approximately 5.9. We found the transitional behavior during the acceleration and deceleration phases. In order to quantitatively examine the wall-shear stress distribution over the transition region, the probability density function of the wall-shear stress was computed. It showed that the negative wall-shear stress events frequently occur near peak systole. In addition, the oscillatory shear stress index was used to further analyze the relationship with the negative wall-shear stress appearing in the systolic phase.

Keywords

Acknowledgement

This work was partly supported by Institute of Information & communications Technology Planning & Evaluation (IITP) grant funded by the Korea government (MSIT) (No.20200002280012003) and a grant from the National Research Foundation of Korea (No.2019M3C1B7025091).

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