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Hybrid computational aeroacoustics based on compressible flow data at low Mach numbers

Stefan Schoder, Flórián Tóth, Manfred Kaltenbacher

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Abstract

Abstract In some practical applications (e.g. cavity with a lip), even at low Mach numbers, acoustic feedback mechanisms excite flow structures. The compressible flow simulation cannot distinguish between a pure fluid dynamic part and acoustic phenomena. With this in mind, we propose a workflow based on Helmholtz‐Hodge decomposition, to extract pure source terms of the compressible flow simulation, to model the sound radiation. (© 2017 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Abstract In some practical applications (e.g. cavity with a lip), even at low Mach numbers, acoustic feedback mechanisms excite flow structures. The compressible flow simulation cannot distinguish between a pure fluid dynamic part and acoustic phenomena. With this in mind, we propose a workflow based on Helmholtz‐Hodge decomposition, to extract pure source terms of the compressible flow simulation, to model the sound radiation. (© 2017 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Available abstract

Abstract In some practical applications (e.g. cavity with a lip), even at low Mach numbers, acoustic feedback mechanisms excite flow structures. The compressible flow simulation cannot distinguish between a pure fluid dynamic part and acoustic phenomena. With this in mind, we propose a workflow based on Helmholtz‐Hodge decomposition, to extract pure source terms of the compressible flow simulation, to model the sound radiation. (© 2017 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Key concepts: Mach number, Compressible flow, Compressibility, Aeroacoustics, Computational aeroacoustics, Flow (mathematics), Acoustics, Helmholtz free energy

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