Haemodynamics Simulation for Carotid Artery Bifurcation
摘要
Finite element method is used to simulate the haemodynamics for carotid artery bifurcation. The model geometry was constructed using in vivo measured dimensions, and in vivo flow waveforms in internal and external carotids and pressure in common carotid artery are used to specify the boundary conditions for simulation. Attentions are paid to the local flow pattern, secondary flow and wall shear stress distribution at the midsinus of internal carotid artery. It is found that flow separation occurs near the outer wall of the internal carotid sinus during the downstroke of systole, and thus induces reversed flow with low velocity. The flow separation is transient and results in the oscillation of wall shear stress from -2 to 6 dyne/cm 2. Secondary flow in the cross section of midsinus presents during the whole cardiac cycle, and the maximum circumferential velocity value is about one-third of the mean axial velocity at the same moment.