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Numerical solutions of unsteady flows with low inlet Mach numbers
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SYSNO ASEP 0342983 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Numerical solutions of unsteady flows with low inlet Mach numbers Author(s) Punčochářová, Petra (UT-L) RID
Furst, Jiří (UT-L)
Horáček, Jaromír (UT-L) RID, ORCID
Kozel, Karel (UT-L) RIDSource Title Mathematics and Computers in Simulation. - : Elsevier - ISSN 0378-4754
Roč. 80, č. 8 (2010), s. 1795-1805Number of pages 11 s. Language eng - English Country NL - Netherlands Keywords finite volume method ; unsteady flow ; low Mach number ; viscous compressible fluid Subject RIV BI - Acoustics R&D Projects IAA200760613 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z20760514 - UT-L (2005-2011) UT WOS 000278820500022 DOI 10.1016/j.matcom.2009.12.006 Annotation This study deals with numerical solution of a 2D unsteady flow a compressible 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 and the flow can represent a model of airflow coming from the trachea, through the glottal region with periodically vibrating vocal folds, and to the human vocal tract. The flow is described by the Navier-Stokes equations. The solution is implemented using the finite volume method and the predictor-corrector MacCormach scheme with Jameson artificial viscosity using a gird of quadrilateral cells and the Arbitrary Lagrangian-Eularian (ALE) method. The numerical results for unsteady flows in the channel are presented for inlet Mach number 0.012, Reynolds number 5000 and wall motion frequency 100 Hz. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2011
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