Numerical solution of compressible and incompressible unsteady flows in channel inspired by vocal tract

[摘要] This study deals with the numerical solution of a 2D unsteady flow of a viscous fluid in a channel for low inlet airflow velocity. The unsteadiness of the flow is caused by a prescribed periodic motion of a part of the channel wall with large amplitudes, nearly closing the channel during oscillations. The channel is a simplified model of the glottal space in the human vocal tract. Four governing systems are considered to describe the unsteady laminar flow of a viscous fluid in the channel. The numerical solution is implemented using the finite volume method (FVM) and the predictor-corrector MacCormack scheme with artificial viscosity using a grid of quadrilateral cells. The unsteady grid of quadrilateral cells is considered in the form of conservation laws using the Arbitrary Lagrangian-Eulerian method. The numerical simulations of flow fields in the channel, acquired from a developed program, are presented for inlet velocity (u) over cap (infinity) = 4.12 m s(-1) and Reynolds number Re-infinity = 4481 and the wall motion frequency 100 Hz. (C) 2014 Elsevier B.V. All rights reserved.

[发布日期] 2014-11-01

[效力级别]  Proceedings Paper

[关键词] Compressible;ncompressible;Unsteady;CFD;Acoustic;Vocal tract