PIV validation of blood-heart valve leaflet interaction modelling
PIV validation of blood-heart valve leaflet interaction modelling
复制标题
DOI：
10.1177/039139880703000712
复制
发表时间：
2007-07-01
影响因子：
1.7
通讯作者：
Verdonck, P.
中科院分区：
文献类型：
--
作者：
Kaminsky, R.;Dumont, K.;Verdonck, P.
本研究的目的是通过实验测量来验证基于流固耦合(FSI)算法的运动心脏瓣膜的二维计算流体动力学(CFD)结果。首先，利用粒子图像测速仪(PIV)对带刚性叶的非欧式叶阀模型的脉动层流流动进行了可视化研究。将流入的数据集应用于包括血液-叶相互作用的CFD模拟，将带有固定叶的测量截面与哈佛仪器脉动血泵、顺应室和储液器串联在标准模拟回路中，以60次/分的频率进行标准2D PIV测量。在泵周期的每10度上对36次锁相测量的平均速度值结果进行评估。对于CFD流动模拟，使用了来自Fluent Inc.的商业软件包，并结合了基于任意拉格朗日-欧拉(ALE)方法的内部开发的FSI代码。然后应用CFD Gia程序对叶片进行剪应力量化，计算结果与PIV计算的主要流动区域的数据基本一致，从而验证了柔性叶片单叶阀的FSI模拟。从而证明了新的CFD程序用于定量计算柔性薄片上的剪应力的适用性。
The aim of this study was to validate the 2D computational fluid dynamics (CFD) results of a moving heart valve based on a fluid-structure interaction (FSI) algorithm with experimental measurements. Firstly, a pulsatile laminar flow through a rnonoleaflet valve model with a stiff leaflet was visualized by means of Particle Image Velocimetry (PIV). The inflow data sets were applied to a CFD simulation including blood-leaflet interaction.The measurement section with a fixed leaflet was enclosed into a standard mock loop in series with a Harvard Apparatus Pulsatile Blood Pump, a compliance chamber and a reservoir Standard 2D PIV measurements were made at a frequency of 60 bpm. Average velocity magnitude results of 36 phase-locked measurements were evaluated at every 10 degrees of the pump cycle. For the CFD flow simulation, a commercially available package from Fluent Inc. was used in combination with in-house developed FSI code based on the Arbitrary Lagrangian-Eulerian (ALE) method. Then the CFD gia code was applied to the leaflet to quantify the shear stress on it.Generally, the CFD results are in agreement with the PIV evaluated data in major flow regions, thereby validating the FSI simulation of a monoleaflet valve with a flexible leaflet. The applicability of the new CFD code for quantifying the shear stress on a flexible leaflet is thus demonstrated.