Aorta flow analysis and heart valve flow and structure analysis
Aorta flow analysis and heart valve flow and structure analysis
复制标题
主动脉血流分析和心脏瓣膜血流和结构分析
DOI：
10.1007/978-3-319-96469-0_2
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发表时间：
2018
影响因子：
4.1
通讯作者：
G. Inoue
中科院分区：
文献类型：
--
作者：
K. Takizawa;T. Tezduyar;Hiroaki Uchikawa;Takuya Terahara;Takafumi Sasaki;Ken Shiozaki;Ayaka Yoshida;Kenji Komiya;G. Inoue
我们给出了我们的计算方法和结果，从主动脉流动分析和心脏瓣膜流动和结构分析。在流动分析中，核心方法是时空变分多尺度(ST-VMS)方法。其他关键方法是ST滑移界面(ST-SI)和ST拓扑变化(ST-TC)方法以及ST等距分析(ST-IGA)。在一般情况下，ST框架提供了更高的阶数精度。ST-VMS的VMS功能解决了与主动脉和心脏瓣膜中不稳定流动的多尺度性质相关的计算挑战。ST框架的移动网格特性使瓣叶附近的高分辨率计算成为可能。ST-SI连接包含小叶的网格扇区，从而实现更有效的网格移动。ST-TC能够实现移动网格计算，即使在由小叶之间的接触所产生的TC的情况下。它处理接触，同时保持传单附近的高分辨率表示。ST-SI和ST-TC的集成能够实现高分辨率表示，即使SI的部分与小叶表面重合。它还能够处理传单-传单接触位置的改变和接触滑动。ST-IGA提供了更平滑的主动脉和瓣膜表面表示，并提高了流动解决方案的准确性。随着ST-IGA与ST-SI和ST-TC的整合，接触区域附近狭窄空间中的元素密度保持在合理的水平。在结构分析中，我们使用Kirchhoff-Love壳模型，在计算曲率项时考虑了第三方向的伸长。给出的计算结果证明了该方法的范围和有效性。
We present our computational methods for and results from aorta flow analysis and heart valve flow and structure analysis. In flow analysis, the core method is the space–time Variational Multiscale (ST-VMS) method. The other key methods are the ST Slip Interface (ST-SI) and ST Topology Change (ST-TC) methods and the ST Isogeometric Analysis (ST-IGA). The ST framework, in a general context, provides higher-order accuracy. The VMS feature of the ST-VMS addresses the computational challenges associated with the multiscale nature of the unsteady flows in the aorta and heart valve. The moving-mesh feature of the ST framework enables high-resolution computation near the valve leaflets. The ST-SI connects the sectors of meshes containing the leaflets, enabling a more effective mesh moving. The ST-TC enables moving-mesh computation even with the TC created by the contact between the leaflets. It deals with the contact while maintaining high-resolution representation near the leaflets. Integration of the ST-SI and ST-TC enables high-resolution representation even though parts of the SI are coinciding with the leaflet surfaces. It also enables dealing with leaflet–leaflet contact location change and contact sliding. The ST-IGA provides smoother representation of aorta and valve surfaces and increased accuracy in the flow solution. With the integration of the ST-IGA with the ST-SI and ST-TC, the element density in the narrow spaces near the contact areas is kept at a reasonable level. In structure analysis, we use a Kirchhoff–Love shell model, where we take the stretch in the third direction into account in calculating the curvature term. The computations presented demonstrate the scope and effectiveness of the methods.
DOI：
10.1016/j.cma.2009.08.013
发表时间：
2009-01-01
影响因子：
7.2
作者：
Kiendl, J.;Bletzinger, K-U.;Wuechner, R.
通讯作者：
Wuechner, R.
DOI：
10.1016/j.cma.2014.10.040
发表时间：
2015-02-01
影响因子：
7.2
作者：
Kamensky D;Hsu MC;Schillinger D;Evans JA;Aggarwal A;Bazilevs Y;Sacks MS;Hughes TJ
通讯作者：
Hughes TJ