颈动脉血管分叉模型内流场分布的PIV测量和数值模拟比较研究

THE COMPARATIVE STUDY OF VELOCITY PROFILES IN CAROTID ARTERY BIFURCATION MODEL BY NUMERICAL SIMULATION CALCULATION AND PARTICLE IMAGING VELOCIMETRY MEASUREMENT

目的:通过对比分析颈动脉血管分叉模型内流场分布的数值模拟计算和粒子成像测速(particle imaging velocimetry,PIV)法量的结果,为今后流场分布的描述选择相适应的方法提供科学依据。方法:分别应用数值模拟方法和PIV定量检测方法,对颈动脉血管分叉模型颈内动脉窦(internal carotid artery sinus,ICAS)区域流场进行模拟计算和实际测量,得到边壁切应力(wall shear stress,WSS)的分布情况。对两种方法得到的结果进行对比统计学分析。结果:从切应力总体分布变化趋势看数字模拟方法与PIV测量计算结果大体一致,但数字模拟方法得到的低切应力核心区域的范围比PIV测量计算得到的范围要小,并且数字模拟方法得到的切应力的绝对值大小比PIV测量计算的数值要大。结论:在反映局部流场分布趋势的时候,应用数值模拟方法更为简单、方便,但若需要详尽的描述局部流场切应力的分布情况,PIV测量方法则为首选。

Objective To supply a reliable basis for the choice of velocity profiles descriptive method . Methods： The wall shear stress in intemal carotid artery sinus of carotid artery bifurcation model was measured and calculated by numerical simulation and particle imaging velocimetry method. Results： The results were similar in the overall distribution of velocity profiles, but the area of low shear stress scope got by numerical simulation was smaller than that by particle imaging velocimetry, and the absolute value of wall shear stress by numerical simulation was larger than that by particle imaging velocimetry. Conclusion： The numerical simulation is simple and convenient when it is only to image the distribution of local velocity profiles. However the particle imaging velocimetry was optimal when it is necessary to fully quantify the wall shear stress distribution.