Degree Type

Thesis

Date of Award

2018

Degree Name

Master of Science

Department

Mechanical Engineering

Major

Mechanical Engineering

First Advisor

Ming-Chen Hsu

Abstract

Many studies have indicated that leaflet fluttering and associated bending in biopros-thetic heart valves (BHVs) is an important criterion in determining the durability of BHVimplants. In this thesis work, a computational methodology for the flutter quantificationof BHV leaflets is presented using an immersogeometric fluid–structure interaction (FSI)framework. The proposed approach is based upon displacement tracking of the BHV leafletfree edges. Integrating over the discrete Fourier transform of free edge displacement data,the energy spectral density is computed for a measure of leaflet flutter. This methodologyseeks to improve approaches used in experimental flutter quantification through utiliza-tion of highly accurate simulation solutions and visualizations to capture a measurement ofleaflet flutter. A set of sampling cases with varying valve material thickness are generatedand FSI-based flutter quantification is performed to investigate the effect of leaflet materialthickness on the presence of flutter and bending in BHVs.

DOI

https://doi.org/10.31274/etd-180810-6119

Copyright Owner

Nelson Michael Wiese

Language

en

File Format

application/pdf

File Size

45 pages

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