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

JOURNAL OF COMPUTATIONAL PHYSICS

卷:227

Article

Luo, Haoxiang²  Mittal, Rajat¹  Zheng, Xudong¹  Bielamowicz, Steven A.³  Walsh, Raymond J.⁴  Hahn, James K.⁵ 

[1] George Washington Univ, Dept Mech & Aerosp Engn, Washington, DC 20052 USA

[2] Vanderbilt Univ, Dept Mech Engn, Nashville, TN 37235 USA

[3] George Washington Univ, Div Otolaryngol, Washington, DC 20052 USA

[4] George Washington Univ, Dept Anat & Cell Biol, Washington, DC 20052 USA

[5] George Washington Univ, Dept Comp Sci, Washington, DC 20052 USA

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

DOI  :  10.1016/j.jcp.2008.05.001

来源: Elsevier

【 摘 要 】

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. (C) 2008 Elsevier Inc. All rights reserved.

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