Title

An immersed-boundary method for flow-structure interaction in biological systems with application to phonation

Document Type

Journal Article

Publication Date

11-20-2008

Journal

Journal of Computational Physics

Volume

227

Issue

22

DOI

10.1016/j.jcp.2008.05.001

Keywords

Bio-flow mechanics; Elasticity; Flow-induced vibration; Flow-structure interaction; Immersed-boundary method; Laryngeal flow; Phonation

Abstract

A new numerical approach for modeling a class of flow-structure interaction problems typically encountered in biological systems is presented. In this approach, a previously developed, sharp-interface, immersed-boundary method for incompressible flows is used to model the fluid flow and a new, sharp-interface Cartesian grid, immersed-boundary method is devised to solve the equations of linear viscoelasticity that governs the solid. The two solvers are coupled to model flow-structure interaction. This coupled solver has the advantage of simple grid generation and efficient computation on simple, single-block structured grids. The accuracy of the solid-mechanics solver is examined by applying it to a canonical problem. The solution methodology is then applied to the problem of laryngeal aerodynamics and vocal fold vibration during human phonation. This includes a three-dimensional eigen analysis for a multi-layered vocal fold prototype as well as two-dimensional, flow-induced vocal fold vibration in a modeled larynx. Several salient features of the aerodynamics as well as vocal fold dynamics are presented. © 2008 Elsevier Inc. All rights reserved.

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