In this study, a fully-coupled fluid-structure interaction model is developed for studying dynamic interactions between compressible fluid and aeroelastic structures. The technique is built based on the modified Immersed Finite Element Method (mIFEM), a robust numerical technique to simulate fluid-structure interactions that has capabilities to simulate high Reynolds number flows and handles large density disparities between the fluid and the solid. For accurate assessment of this intricate dynamic process between compressible fluid, such as air and aeroelastic structures, we included in the model the fluid compressibility in an isentropic process and a solid contact model. The accuracy of the compressible fluid solver is verified by examining acoustic wave propagations in a closed and an open duct, respectively. The fully-coupled fluid-structure interaction model is then used to simulate and analyze vocal folds vibrations using compressible air interacting with vocal folds that are represented as layered viscoelastic structures. Using physiological geometric and parametric setup, we are able to obtain a self-sustained vocal fold vibration with a constant inflow pressure. Parametric studies are also performed to study the effects of lung pressure and vocal fold tissue stiffness in vocal folds vibrations. All the case studies produce expected airflow behavior and a sustained vibration, which provide verification and confidence in our future studies of realistic acoustical studies of the phonation process.

中文翻译：

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具有流体可压缩性的全耦合气动弹性仿真 - 适用于声带振动

在这项研究中，开发了一个完全耦合的流固相互作用模型，用于研究可压缩流体和气动弹性结构之间的动态相互作用。该技术基于改进的浸入式有限元法 (mIFEM) 构建，这是一种用于模拟流体-结构相互作用的强大数值技术，能够模拟高雷诺数流动并处理流体和固体之间的大密度差异。为了准确评估可压缩流体（例如空气和气动弹性结构）之间的复杂动态过程，我们在模型中包含了等熵过程中的流体可压缩性和固体接触模型。通过分别检查封闭管道和开放管道中的声波传播来验证可压缩流体求解器的准确性。然后，使用全耦合流固相互作用模型来模拟和分析声带振动，使用可压缩空气与声带相互作用，声带表示为分层粘弹性结构。使用生理几何和参数设置，我们能够获得具有恒定流入压力的自持声带振动。还进行参数研究来研究肺压和声带组织硬度对声带振动的影响。所有案例研究都会产生预期的气流行为和持续振动，这为我们未来对发声过程的现实声学研究提供了验证和信心。