Numerical simulation of unsteady compressible flows in vocal tract model

0347990 - ÚT 2011 RIV DE eng A - Abstract
Pořízková, P. - Kozel, K. - Horáček, Jaromír
Numerical simulation of unsteady compressible flows in vocal tract model.
AQL 2010. Erlangen: University Hospital Erlangen, 2010 - (Dollinger, M.). s. 72-72. ISBN N. ISSN N.
[International Conference on Advances in Quantitative Laryngology, Voice and Speech Research /9./. 10.09.2010-11.09.2010, Erlangen]
R&D Projects: GA MŠMT OC09019
Institutional research plan: CEZ:AV0Z20760514
Keywords : biomechanics of human voice * Coanda effect * finite volume method applied on viscous flow
Subject RIV: BI - Acoustics

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 2D system of Navier-Stokes equations was considered for the unsteady laminar flow of a compressible viscous fluid in a channel. The numerical solution is implemented using the Finite Volume Method and the predictor-corrector MacCormak scheme with Jameson artificial viscosity using a grid of quadrilateral cells. The results show that some numerical results of viscous flow in a symmetric grid and scheme can be non-symmetrical, depending on the geometry and Reynolds number.
Permanent Link: http://hdl.handle.net/11104/0188622