Počet záznamů: 1

Simulation of unsteady compressible flow in a channel with vibrating walls - Influence of the frequency

  1. 1.
    0359140 - UT-L 2012 RIV GB eng J - Článek v odborném periodiku
    Punčochářová-Pořízková, P. - Kozel, K. - Horáček, Jaromír
    Simulation of unsteady compressible flow in a channel with vibrating walls - Influence of the frequency.
    Computers & Fluids. Roč. 46, č. 1 (2011), s. 404-410 ISSN 0045-7930
    Grant CEP: GA MŠk OC09019
    Výzkumný záměr: CEZ:AV0Z20760514
    Klíčová slova: finite volume method * unsteady flow * low Mach number * viscous compressible fluid
    Kód oboru RIV: BI - Akustika a kmity
    Impakt faktor: 1.810, rok: 2011
    http://www.sciencedirect.com/science/article/pii/S0045793010003439

    This study deals with the numerical solution of a 2D unsteady flow of a compressible viscous fluid in a channel for flow 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 to the human vocal tract. The flow is described by the system of Navier-Stokes equations for laminar flows. The numerical solution is implemented using the finite volume method (FVM) and the predictor-corrector McCormack scheme with Jameson artificial viscosity using a gird of quadrilateral cells. Due to the motion of the gird, the basic system of conservation laws is considered in the Arbitrary Lagrangian-Eulerian (ALE) form. The numerical results for unsteady flows in the channel are presented for M=0,012, Re =4500 and the wall motion frequency 20 and 100Hz.
    Trvalý link: http://hdl.handle.net/11104/0196979