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Numerical Modelling of some Problems in Nonlinear Acoustics

AuthorsCampos-Pozuelo, Cleofé; Vanhille, Christian; Dubus, Bertrand
KeywordsNonlinear Acoustics
Numerical approximations
Acoustic field propagation
Finite-difference algorithm
Thermoviscous fluids
Issue DateSep-2001
PublisherAcoustical Society of Italy
Citation17th International Congress on Acoustics, Signal-Computational-Numerical, Numerical methods in acoustics, 5B.04.01
AbstractSome recent developments in numerical nonlinear acoustics are presented. First a three dimensional perturbation approach based on the finite-element method is described. This procedure can predict the propagation of acoustic fields produced by sources of arbitrary geometry as well as the pressure distribution inside a three dimensional cavity including boundary layer absorption. Its main limitation is due to its range of validity limited to waves of finite but moderate amplitude. We then describe a second approach: a numerical model for nonlinear waves and weak shocks in thermoviscous fluids based in a time-domain finite-difference algorithm. This algorithm does not present any practical limitations about the amplitude of the wave but it is referred to one-dimensional problems. Some future trends are also commented.
DescriptionCommunication presented at the 17th International Congress on Acoustics, Rome, 2-7 September 2001.
Appears in Collections:(IA) Comunicaciones congresos
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