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| Haemodynamics simulation of carotid artery bifurcation |
| Revised:November 14, 2002 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20044084 |
| KeyWord:haemodynamics,atherosclerosis,wall shear stress,finite element method |
| Liu Youjun~* Qiao Aike Zhu Haiwen Gao Song |
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| Abstract: |
| Finite element method is utilized to simulate the haemodynamics of carotid artery bifurcation. The model geometry is constructed with in vivo measured dimensions to maintain the anatomic accuracy, and in order to keep the physiological realistic blood flow in simulation, in vivo flow waveforms in internal and external carotids and pressure waveform in common carotid artery are adopted to specify the boundary conditions for simulation. Attentions are specially paid to the local flow pattern, secondary flow and wall shear stress distribution at the midsinus of the internal carotid artery. It is found that flow separation occurs near the outer wall of the internal carotid sinus at some moment within the downstroke of systole and diastole phase of the cardiac cycle, and thus induces a reversed flow at very low speed. The flow separation is transient and results in the oscillation of wall shear stress from -2 to 6 dyn/cm~2. Secondary flow in the cross section of midsinus exists during the whole cardiac cycle, and the maximum circumferential velocity is about one-third of the mean axial velocity at the same moment. |
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