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Simulating Free-Surface FSI and Fatigue Damage in Wind-Turbine Structural Systems Read chapter Read first chapter

2018 | OriginalPaper | Chapter

Aorta Flow Analysis and Heart Valve Flow and Structure Analysis

Authors : Kenji Takizawa, Tayfun E. Tezduyar, Hiroaki Uchikawa, Takuya Terahara, Takafumi Sasaki, Kensuke Shiozaki, Ayaka Yoshida, Kenji Komiya, Gaku Inoue

Published in: Frontiers in Computational Fluid-Structure Interaction and Flow Simulation

Publisher: Springer International Publishing

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Abstract

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.

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previous chapter Simulating Free-Surface FSI and Fatigue Damage in Wind-Turbine Structural Systems
next chapter Residual-Based Large Eddy Simulation with Isogeometric Divergence-Conforming Discretizations
Appendix
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Metadata
Title
Aorta Flow Analysis and Heart Valve Flow and Structure Analysis
Authors
Kenji Takizawa
Tayfun E. Tezduyar
Hiroaki Uchikawa
Takuya Terahara
Takafumi Sasaki
Kensuke Shiozaki
Ayaka Yoshida
Kenji Komiya
Gaku Inoue
Copyright Year
2018
Book
Frontiers in Computational Fluid-Structure Interaction and Flow Simulation

Print ISBN: 978-3-319-96468-3

Electronic ISBN: 978-3-319-96469-0

Copyright Year: 2018

DOI
https://doi.org/10.1007/978-3-319-96469-0_2

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