Instability of a cantilevered flexible plate in viscous channel flow
Instability of a cantilevered flexible plate in viscous channel flow
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DOI：
10.1016/j.jfluidstructs.2005.05.005
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发表时间：
2005-10-01
影响因子：
3.6
通讯作者：
Lucey, AD
中科院分区：
文献类型：
--
作者：
Balint, TS;Lucey, AD
本文研究了在粘性槽道流中悬臂柔性板的稳定性，作为人体上呼吸道动力学的一个代表。重点是软腭（弹性板）的不稳定机制，导致睡眠期间气道阻塞。我们解决的Navier-Stokes方程的流动与雷诺数高达1500完全耦合的动力学的板块运动解决使用有限差分。这项研究是2-D和基于线性板力学。当上、下气道均打开时，平板通过颤振机制失稳，存在临界雷诺数。当一个气道关闭时，板主要通过发散机制失去稳定性，并且存在临界流速。然而，低于发散起始流速，颤振可能存在于柔性板中的低水平的结构阻尼。我们的研究结果有助于扩展对悬臂柔性板流动诱导不稳定性的理解，并将最终提高上气道疾病的诊断和治疗。(c)2005爱思唯尔有限公司保留所有权利。
The stability of a flexible cantilevered plate in viscous channel flow is studied as a representation of the dynamics of the human upper air-way. The focus is on instability mechanisms of the soft palate (flexible plate) that cause airway blockage during sleep. We solve the Navier-Stokes equations for flow with Reynolds numbers up to 1500 fully coupled with the dynamics of the plate motion solved using finite-differences. The study is 2-D and based upon linearized plate mechanics. When both upper and lower airways are open, the plate is found to lose its stability through a flutter mechanism and a critical Reynolds number exists. When one airway is closed, the plate principally loses its stability through a divergence mechanism and a critical flow speed exists. However, below the divergence-onset flow speed, flutter can exist for low levels of structural damping in the flexible plate. Our results serve to extend understanding of flow-induced instability of cantilevered flexible plates and will ultimately improve the diagnosis and treatment of upper-airway disorders. (c) 2005 Elsevier Ltd. All rights reserved.