kth_logo.gif

Article

Flow and Acoustics Simulations Based on LES and an Acoustic Analogy; an Application to Laryngeal Airflow.

Authors: Mihaescu, M, Gutmark, E., Khosla, S., Scherer, , Fuchs, L.F.
Document Type: Article
Pubstate: Published
Journal: 45th AIAA Aerospace Sciences Meeting and Exhibit.
Volume: AIAA 2007-919   13 pages
Year: 2007

Abstract

The paper presents an efficient method for computational aeroacoustics applied to simulate the flow and the acoustics for a static laryngeal model considering the vocal folds widely open. The work analyses the whisper-like process defined as the sound generated by the turbulent glottal airflow in the absence of vocal fold vibration. A decomposition of the flow variables is used that allows separation of flow and acoustic computations. The approach consists in solving the low Mach number flow field by incompressible Large Eddy Simulation. This provides the possibility to compute the acoustic sources. The inhomogeneous wave equation derived from the fundamental equations of motion for a compressible fluid is employed to compute the acoustic field. The purpose of the study is to provide realistic numerical predictions of the flow patterns and the generated acoustic field in the glottis and the vocal tract regions.