Heart valve isogeometric sequentially-coupled FSI analysis with the space窶鍍ime topology change method
Heart valve isogeometric sequentially-coupled FSI analysis with the space窶鍍ime topology change method
复制标题
空间“拓扑变化法”心脏瓣膜等几何顺序耦合FSI分析
DOI：
10.1007/s00466-019-01813-0
复制
发表时间：
2020
影响因子：
4.1
通讯作者：
and M.-C. Hsu
中科院分区：
文献类型：
--
作者：
T. Terahara;K. Takizawa;T.E. Tezduyar;Y. Bazilevs;and M.-C. Hsu
心脏瓣膜的流固耦合分析是心血管流体力学中计算难度较大的问题之一。挑战包括通过复杂几何形状的非稳定流动、具有大运动的固体表面以及瓣叶之间的接触。我们在这里介绍一个等几何顺序耦合流固耦合（SCFSI）方法，可以解决的挑战，高保真的流动解决方案的结果。SCFSI分析能够在求解序列的不同步骤中分别处理流体和结构部分，并且还能够在不同步骤中使用不同的方法或不同的网格分辨率水平。在这里的等几何SCFSI分析中，第一步是先前计算的（完全）心脏瓣膜的耦合浸没几何分析FSI，具有合理的流量解。与瓣叶和动脉表面的运动来自，我们执行一个新的，高保真度的流体力学计算与时空拓扑变化方法和等几何离散。沉浸几何方法和时空方法都是变分多尺度方法。人工生物心脏瓣膜的计算证明了所介绍的方法的能力。
Heart valve fluid–structure interaction (FSI) analysis is one of the computationally challenging cases in cardiovascular fluid mechanics. The challenges include unsteady flow through a complex geometry, solid surfaces with large motion, and contact between the valve leaflets. We introduce here an isogeometric sequentially-coupled FSI (SCFSI) method that can address the challenges with an outcome of high-fidelity flow solutions. The SCFSI analysis enables dealing with the fluid and structure parts individually at different steps of the solutions sequence, and also enables using different methods or different mesh resolution levels at different steps. In the isogeometric SCFSI analysis here, the first step is a previously computed (fully) coupled Immersogeometric Analysis FSI of the heart valve with a reasonable flow solution. With the valve leaflet and arterial surface motion coming from that, we perform a new, higher-fidelity fluid mechanics computation with the space–time topology change method and isogeometric discretization. Both the immersogeometric and space–time methods are variational multiscale methods. The computation presented for a bioprosthetic heart valve demonstrates the power of the method introduced.