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Three-dimensional non-reflective boundary conditions for acoustic simulations: far field formulation and validation test cases

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In aeroacoustic simulations, non-reflective boundary conditions are necessary to minimize the acoustic waves reflected when disturbances leave the computational domain. In the present paper, far field boundary conditions are developed for a 3-D geometry. Two validation test cases involving respectively an acoustic pulse and an axisymmetric ring vortex in a uniform mean flow are also proposed. The solutions from linearized Euler equations show that the far field boundary conditions allow the exit of acoustic waves without generating significant spurious waves. The exit of vortical disturbances is more difficult to treat with efficiency because of their high magnitude. For this case, the implementation of a sponge zone is presented to decrease the amplitude of acoustic reflections.
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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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