HEMODYNAMICS FOR ASYMMETRIC INLET AXIAL VELOCITY PROFILE IN CAROTID BIFURCATION MODEL

• Published in: Journal of Hydrodynamics Vol. 20; no. 5; pp. 656 - 661
• Main Authors: DING, Zu-rong, LIU, Bin, YANG, Shuo, XIA, Yan
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.10.2008; Springer Singapore
• Subjects: carotid bifurcation; Engineering; Engineering Fluid Dynamics; Hydrology/Water Resources; inlet velocity profile; Numerical and Computational Physics; numerical simulation; Simulation; Wall Shear Stress Gradient (WSSG); Wall Shear Stress(WSS); 数字模拟技术; 生物工程; 血流动力学; 颈动脉; carotid bifurcation; inlet velocity profile; Wall Shear Stress(WSS); Wall Shear Stress Gradient (WSSG); numerical simulation
• ISSN: 1001-6058; 1878-0342; 1000-4874
• DOI: 10.1016/S1001-6058(08)60109-2

The asymmetric inlet velocity profile has been observed in phantom model using LDA and in health subjects using Magnet Resonance （MR）. The effects of asymmetric inlet axial velocity profile on the flow field and the Wall Shear Stress （WSS） of carotid bifurcation were numerically studied herein with the TF-AHCB model, The results show that the Wall Shear Stress Gradient （WSSG） in the front part of the sinus for inward-tilting inlet axial velocity profile is nearly 2 times of that for the symmetric one in the beginning of systole, the end of systole, and diastole, respectively. The area of WSS below 5× 10^-3 Pa at the outer wall of the sinus for outward-tilting inlet axial velocity profile is 1.5 times of that for the inward-tilting one during diastole of the cardiac cycle. The asymmetric inlet velocity profiles can reduce the flow velocity near the inner wall of the sinus, which has been normally considered a high velocity region. It is concluded that besides bifurcation geometry and flow waveform, the asymmetry of inlet velocity profile is probably a factor influencing atherosclerosis.