Eulerian Time-Domain Model for Sound Propagation over a Finite-Impedance Ground Surface. Comparison with Frequency-Domain Models
An Eulerian model for sound propagation in an inhomogeneous moving medium is described. The model is based on numerical solution of the linearized Euler equations of fluid dynamics. As the model is formulated in the time domain, common acoustic boundary conditions in terms of a complex acoustic impedance cannot be used. Consequently, the model cannot be used directly for sound propagation over a finite-impedance ground surface. This problem is solved by including the ground medium in the computational system. The ground is modeled as a porous medium with a rigid frame. Numerical examples show that results of the Eulerian model are in excellent agreement with solutions of the Helmholtz equation in the frequency domain.
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Document Type: Research Article
Publication date: July 1, 2002
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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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