Computational flow analysis with boundary layer and contact representation: II. Heart valve flow with leaflet contact

Computational flow analysis with boundary layer and contact representation: II. Heart valve flow with leaflet contact
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边界层和接触表示的计算流分析:II。

DOI:
10.1093/jom/ufac013
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发表时间:
2022
影响因子:
1.7
通讯作者:
T.E. Tezduyar
T.E. Tezduyar
中科院分区:
工程技术4区
文献类型:
--
作者:
T. Terahara;T. Kuraishi;K. Takizawa;T.E. Tezduyar

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在这篇由两部分组成的文章的第二部分中,我们概述了使用边界层和接触表示进行的心脏瓣膜流动分析,这通过第一部分中描述的时空 (ST) 计算方法成为可能。通过这些 ST 方法,我们能够以移动网格方法获得的精度来表示移动固体表面(包括瓣膜小叶表面)附近的边界层,并且无需在接触的表面之间留下网格保护间隙。在不放弃小叶表面附近的高分辨率流表示的情况下表示小叶之间的接触的挑战已经被克服。已克服的其他挑战包括接近实际的瓣膜几何形状的复杂性,在计算模型中具有具有解剖学真实运动的左心室和来自 CT 扫描的主动脉,并保持心室-瓣膜-主动脉序列流入处的流动稳定性,其中我们在心动周期的一部分期间具有牵引边界条件。
In this second part of a two-part article, we provide an overview of the heart valve flow analyses conducted with boundary layer and contact representation, made possible with the space–time (ST) computational methods described in the first part. With these ST methods, we are able to represent the boundary layers near moving solid surfaces, including the valve leaflet surfaces, with the accuracy one gets from moving-mesh methods and without the need for leaving a mesh protection gap between the surfaces coming into contact. The challenge of representing the contact between the leaflets without giving up on high-resolution flow representation near the leaflet surfaces has been overcome. The other challenges that have been overcome include the complexities of a near-actual valve geometry, having in the computational model a left ventricle with an anatomically realistic motion and an aorta from CT scans and maintaining the flow stability at the inflow of the ventricle-valve-aorta sequence, where we have a traction boundary condition during part of the cardiac cycle.
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