Luo Haoxiang, Mittal Rajat, Bielamowicz Steven A
Department of Mechanical Engineering, Vanderbilt University, 2301 Vanderbilt Place, Nashville, TN 37235, USA.
J Acoust Soc Am. 2009 Aug;126(2):816-24. doi: 10.1121/1.3158942.
A recently developed immersed-boundary method is used to model the flow-structure interaction associated with the human phonation. The glottal airflow is modeled as a two-dimensional incompressible flow driven by a constant subglottal pressure, and the vocal folds are modeled as a pair of three-layered, two-dimensional, viscoelastic structures. Both the fluid dynamics and viscoelasticity are solved on fixed Cartesian grids using a sharp-interface immersed boundary method. It is found that the vibration mode and frequency of the vocal fold model are associated with the eigenmodes of the structures, and that the transition of the vibration mode takes place during onset of the sustained vibration. The computed glottal waveforms of the volume flux, velocity, and pressure are reasonably realistic. The glottal flow features an unsteady jet whose direction is deflected by the large-scale vortices in the supraglottal region. A detailed analysis of the flow and vocal fold vibrations is conducted in order to gain insights into the biomechanics of phonation.
一种最近开发的浸入边界方法被用于模拟与人类发声相关的流固相互作用。声门气流被建模为在恒定声门下压力驱动下的二维不可压缩流，声带被建模为一对三层二维粘弹性结构。流体动力学和粘弹性都使用尖锐界面浸入边界方法在固定笛卡尔网格上求解。研究发现，声带模型的振动模式和频率与结构的本征模式相关，并且振动模式的转变发生在持续振动开始时。计算得到的声门体积通量、速度和压力波形相当逼真。声门流具有不稳定射流，其方向被声门上区域的大尺度涡旋偏转。为了深入了解发声的生物力学，对流动和声带振动进行了详细分析。
