[논문]협착된 경동맥내 천이 유동 수치 해석

김동민; 황진율; 민두재; 조원민

doi:10.5407/jksv.2022.20.1.052

협착된 경동맥내 천이 유동 수치 해석
Numerical Analysis of Transitional Flow in a Stenosed Carotid Artery 원문보기

한국가시화정보학회지= Journal of the Korean society of visualization, v.20 no.1, 2022년, pp.52 - 63

김동민 (School of Mechanical Engineering, Pusan National University) , 황진율 (School of Mechanical Engineering, Pusan National University) , 민두재 (Department of Anesthesiology and Pain Medicine, Korea University Ansan Hospital, Korea University College of Medicine) , 조원민 (Department of Thoracic & Cardiovascular Surgery, Korea University Ansan Hospital, Korea University College of Medicine)

Abstract ▼ AI-Helper

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.

주제어

표/그림 (9)

그림 Fig. 1. (a) CTA demonstrating ICA stenosis in the left carotid artery. (b) Geometry model of the carotid artery extracted from the CTA data. (c) A magnified view of the region in (b). (d) Surface mesh with local sizing.
그림 Fig. 2. (a) Surface mesh from CCA to ICA through stenosis. Cross-section planes of the volume mesh at pre-stenosis (b) and post-stenosis (c) locations indicated by the red solid line in (a).
그림 Fig. 3. Flowrate waveform imposed in the inlet boundary condition. Here, the waveform is consistent with that used in Lee et al.(30).
그림 Fig. 4. (a) Isosurfaces of u_z = −0.1 m/s (blue) and u_z = 2.3 m/s (red) near peak systole. (b) Streamlines near peak systole. (c) Instantaneous velocity fields in the cross-section slice A-A' .
표 Table 1. Reynolds numbers.
그림 Fig. 5. Instantaneous vorticity magnitude (|ω|) contours on the mid-plane of the bifurcation at various flow phase: (a) acceleration phase; (b) near peak systole; (c) deceleration phase; and (d) diastole.
그림 Fig. 6. Isosurfaces of instantaneous vortical structures (λ₂ = −1,500,000/ s² at various flow phase: (a) acceleration phase; (b) near peak systole; (c) deceleration phase; and (d) diastole. The color denotes the magnitude of the vorticity vector |ω|.
그림 Fig. 7. Probability density function of wall shear stress (τ_z) within the transitional flow region. The green line indicates the PDF obtained over 4 cycles and the red lines denotes the PDF computed near peak systole.
그림 Fig. 8. (a) Contours of the OSI in the post stenotic region. (b) Negative WSS (τ_z < 0) region near peak systole. The black line is all the negative WSS area.

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