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Numerical Investigation of the Mean Flow Effect on the Acoustic Reflection at the Open End of Clarinet-Like Instruments

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This article investigates the influence of a mean flow on the magnitude of the reflection coefficient |R| and on the length correction l at the end of clarinet-like instruments. The investigations are conducted on a cylindrical pipe terminated by a catenoidal horn using an axisymmetric numerical model based on the lattice Boltzmann method. The simulations are carried out using input values of the mean flow found experimentally for different dynamic playing levels (pianissimo, mezzo forte and fortissimo) and different reed types (soft and hard). The results show that |R| is unaffected in the range of mean flows corresponding to the different dynamic levels analyzed. Conversely, the end correction l appears to be considerably more sensitive to variations of the dynamic level, particularly in the low frequency region. Nevertheless, the results obtained indicate a small effect for musical contexts and thus generally substantiate the zero mean flow assumption commonly used to predict the acoustic transmission and the dynamic response of clarinet-like systems.
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Document Type: Research Article

Publication date: 01 September 2010

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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