Chinese Journal of Tissue Engineering Research ›› 2023, Vol. 27 ›› Issue (28): 4468-4472.doi: 10.12307/2023.439

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Effect of blood viscosity on computational fluid dynamics in vascular network

Zheng Liqin1, 2, Lai Hourong1, Dai Yuexing1, He Xingpeng1, Wu Minhui1, Zheng Desheng1, Lin Ziling3   

  1. 1The First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China; 2Laboratory of Digital Orthopedics and Biomechanics, Lingnan Medical Research Center, Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China; 3Department of Orthopedic Trauma, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China
  • Received:2022-04-15 Accepted:2022-07-14 Online:2023-10-08 Published:2023-01-29
  • Contact: Lin Ziling, MD, Chief physician, Professor, Doctoral supervisor, Department of Orthopedic Trauma, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China
  • About author:Zheng Liqin, Master, Physician, The First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China; Laboratory of Digital Orthopedics and Biomechanics, Lingnan Medical Research Center, Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China
  • Supported by:
    the National Natural Science Foundation of China, No. 81673996 (to LZL)

Abstract: BACKGROUND: Patients with osteoporosis patients often present with increased blood viscosity, which belongs to the category of “blood stasis” in traditional Chinese medicine. How, the effects of increased blood viscosity on microvascular fluid properties remain to be elucidated.
OBJECTIVE: To investigate the effect of blood viscosity on the hydrodynamics of vascular network by computational fluid dynamics. 
METHODS: The three-dimensional model of vascular network was constructed based on the Geometry module of ANSYS 19.0 software, and the vascular network was then meshed to tetrahedral elements in Mesh module. The vascular network was assumed to rigid wall without slip, and the blood was assumed to laminar, viscous, and incompressible Newtonian fluid. Blood density, velocity, and a series of blood viscosity coefficients were also established. The Navier-Stokes equation was adopted for simulation. The effects of blood viscosity on the hydrodynamics of different parts of vascular network were analyzed. 
RESULTS AND CONCLUSION: The streamline, velocity, mass flow, and wall shear stress in the vascular network demonstrated a “U” shaped distribution, that is, these contents in outlet and inlet were higher than those in the junction of the vascular network. With the increase of blood viscosity, the streamline, velocity, and mass flow in each part of vascular network became sparse and decreased slightly; however, the wall shear stress increased significantly. The largest percentage change in wall shear stress was observed at the intersection of vascular network. To conclude, blood viscosity will change the hydrodynamics of the vascular network, especially in term of wall shear stress. Computational fluid dynamics can provide a good insight into the influence of blood viscosity alteration on the hydrodynamic performance of the blood, thereby providing a new research tool for the study of osteoporosis based on the coupling of angiogenesis and osteogenesis by tonifying the kidney and activating the blood circulation.

Key words: osteoporosis, tonifying the kidney and activating blood circulation, blood viscosity, computational fluid dynamics, angiogenic and osteogenic coupling

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