A comprehensive fluid structure acoustic modeling tool development for vocal vibration simulation*

Voice production is a fluid structure interaction (FSI) process between glottal airflow and vocal fold tissue, which is a two-way coupling. Regarding the low Mach number for human phonation, we can simplify it into flow induce sound, which is a one-way couple. We aim to develop a comprehensive fluid structure acoustic interaction modeling tool for vocal fold vibrations, which can be applied to various disease related voice disorders. In this work, we aim to use the retro 3D FSI results and animal experiments to test the flow induced sound solver. Linearized perturbed compressible equation (LPCE) is employed to predict sound propagation. The LPCE is discretized by low-dissipation and low-dispersion finite difference stencils, with careful treatments on the near wall region and the non-reflection boundaries. The source terms of the LPCE are extracted from the three-dimensional incompressible simulation results of the flow in rabbit larynges. The acoustic fields in the simplified vocal fold model, subject specific models with healthy phonation and voice disorder will be simulated respectively. The relations between vocal fold vibration patterns and acoustic performance will be discussed.