Zonal direct-hybrid aeroacoustic simulation of trailing edge noise using a high-order discontinuous Galerkin spectral element method

Kempf, Daniel; Munz, Claus‐Dieter

doi:10.1051/aacus/2022030

Cited by 4 publications

(2 citation statements)

References 34 publications

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“…Therefore, DNS is an ideal candidate if acoustics should be predicted in steady flow regions and the energy conversation process is not a subject of the study. Until now, the huge demand on computational resources limits the applicability in aeroacoustics [146].…”

Section: Definition Of Acousticsmentioning

confidence: 99%

Computational aeroacoustics of the EAA benchmark case of an axial fan

Schoder

Junger

2020

Acta Acust.

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This contribution benchmarks the aeroacoustic workflow of the perturbed convective wave equation and the Ffowcs Williams and Hawkings analogy in Farassat’s 1A version for a low-pressure axial fan. Thereby, we focus on the turbulence modeling of the flow simulation and mesh convergence concerning the complete aeroacoustic workflow. During the validation, good agreement has been found with the efficiency, the wall pressure sensor signals, and the mean velocity profiles in the duct. The analysis of the source term structures shows a strong correlation to the sound pressure spectrum. Finally, both acoustic sound propagation models are compared to the measured sound field data.

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Section: Definition Of Acousticsmentioning

confidence: 99%

Computational aeroacoustics of the EAA benchmark case of an axial fan

Schoder

Junger

2020

Acta Acust.

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“…We made several design decisions to avoid usual bottlenecks: Input/Output (I/O) operations should be kept to a minimum in high-performance computing [5]. Therefore, we solve fluid and acoustic simulations side by side and skip the expensive I/O.…”

Section: Introductionmentioning

confidence: 99%

Discontinuous Galerkin methods for the acoustic conservation equations with application to aeroacoustic

Heinz,

Kaltenbacher

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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The acoustic conservation equations are a subset of the compressible flow equations and describe the generation and propagation of acoustic waves by the two acoustic primary variables: acoustic pressure and acoustic particle velocity. Therefore, the equations (an exact reformulation of the APE-2) can be natively used in the context of hybrid aeroacoustic. In order to achieve a stable finite element (FE) approximation by the continuous Galerkin method, these two physical quantities have to be defined in different Sobolev spaces to fulfill the Ladyzhenskaya-Babuška-Brezzi condition. Another approach is to apply the Discontinuous Galerkin (DG) method, which enforces coupling between elements via numerical fluxes in surface integrals only and thus has advantages regarding computational efficiency. We present a high-order DG formulation that yields optimal spatial and temporal convergence rates and provide implementational details in the context of hybrid aeroacoustics. Furthermore, the application to an aeroacoustic test case demonstrates the developed DG approach's suitability for aeroacoustic computations.

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An active hybrid Reynolds-averaged Navier–Stokes/large eddy simulation approach for gray area mitigation

Mehta,

Manceau,

Duffal

et al. 2023

Physics of Fluids

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During the transition from the RANS (Reynolds-Averaged Navier–Stokes) mode to the LES (Large Eddy Simulation) mode, i.e., in the so-called gray area, continuous hybrid RANS/LES approaches suffer from the well-known problem of excessively slow generation of resolved structures. Indeed, when the mesh is refined in the direction of the flow, the model is designed to reduce the modeled energy, but there is no mechanism to transfer the equivalent amount of energy into the resolved motion. Hence, the total turbulent energy and turbulent stresses are underestimated, which strongly affects the prediction of the mean flow. This also constitutes a violation of the conservation of mechanical energy, which can only be corrected by an active approach, i.e., an approach that allows the injection of resolved energy. The aim of this work is to develop such an active approach based on the introduction of a fluctuating volume force into the resolved momentum equation, similar to the anisotropic linear forcing (ALF) method proposed previously. The major difference with ALF is that the new method does not require target statistics obtained by a RANS computation but is based on a simple analysis of the rate of energy transfer related to variations in resolution, enabling the forcing to be extended to continuous hybrid RANS/LES. The application of the new method to the cases of a channel with or without periodic constriction shows a drastic improvement over the case without forcing. Although the method is applied herein to a particular hybrid RANS/LES approach (HTLES, hybrid temporal LES), it can easily be extended to any other approach, as long as a parameter identifies variations in resolution, and thus offers vast application prospects.

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Zonal direct-hybrid aeroacoustic simulation of trailing edge noise using a high-order discontinuous Galerkin spectral element method

Cited by 4 publications

References 34 publications

Computational aeroacoustics of the EAA benchmark case of an axial fan

Computational aeroacoustics of the EAA benchmark case of an axial fan

Discontinuous Galerkin methods for the acoustic conservation equations with application to aeroacoustic

An active hybrid Reynolds-averaged Navier–Stokes/large eddy simulation approach for gray area mitigation

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