Computational Aeroacoustics for HVAC Systems Utilizing a Hybrid Approach

Hüppe, Andreas; Reppenhagen, Aaron; Tautz, Matthias; Becker, Stefan; Kuehnel, Wolfram

doi:10.4271/2016-01-1808

Cited by 12 publications

(11 citation statements)

References 13 publications

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“…have to be computed from the flow field obtained in the first step [35]. The hybrid approach is commonly applied in computational aeroacoustics (CAA) [3,16,18,27,[39][40][41] due to several advantages:…”

Section: Hybrid Aeroacoustic Approachmentioning

confidence: 99%

Efficient numerical simulation of the human voice

Maurerlehner

Schoder

Freidhager

et al. 2021

Elektrotech. Inftech.

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The process of voice production is a complex process and depends on the correct interaction of the vocal folds and the glottal airstream inducing the primary voice source, which is subsequently modulated by the vocal tract. Due to the restricted access to the glottis, not all aspects of the three-dimensional process can be captured by measurements without influencing the measurement object. Hence, the application of a numerical tool capturing the physical process of phonation can provide an extended database for voice treatment and, therefore, can contribute to an increased effectiveness of voice treatment. However, such numerical models involve complex and demanding procedures to model the material behavior and the mechanical contact of the vocal folds and to realize moving boundaries of the involved physical domains. The present paper proposes a numerical model called simVoice, which circumvents these computational expenses by prescribing the experimentally obtained vocal fold motion within the simulation. Additionally, a hybrid approach for sound computation further enhances the computational efficiency and yields good agreement with acoustic measurements. An analysis of the computational workloads suggests that the key factor for a further increase in efficiency is an optimized flow simulation and source term computation.

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Section: Hybrid Aeroacoustic Approachmentioning

confidence: 99%

Efficient numerical simulation of the human voice

Maurerlehner

Schoder

Freidhager

et al. 2021

Elektrotech. Inftech.

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“…The acoustic velocity potential φ a is related to the acoustic particle velocity and the acoustic pressure via (2.53). PCWE has been applied to HVAC systems 181,182 extensively. The prediction of fan noise 42,60,183,184 as well as human phonation 185,186 suits the assumptions of this equation.…”

Section: Perturbed Convective Wave Equation (Pcwe)mentioning

confidence: 99%

Hybrid Aeroacoustic Computations: State of Art and New Achievements

Schoder

2019

J. Theor. Comp. Acout.

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This paper collects the state of the art and the tremendous progress that has been made in hybrid modeling of aeroacoustic sound. Hybrid modeling is defined such that flow and acoustics are modeled separate and connected by an aeroacoustic model. The contributions will be classified with respect to the aeroacoustic models being developed, covering Lighthill’s analogy, Ffowcs Williams and Hawkings, vortex sound, linearized Euler equations (LEE), and different perturbation equations modeling flow induced sound. Within each topic, specific applications, such as jet noise, aircraft noise, ground mobility, noise, fan noise and human phonation, are covered. We focus on the accomplishments and provide the authors’ contribution to aeroacoustic research. Eventually, a concise summary of the different methods and their capabilities is included.

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“…Therefore, the constant density flow model is applied to the fluid dynamics part of the problem, which calculates the sound sources for the acoustics wave equation. This wave equation model was first derived, implemented into an FEM solver and extensively tested by Kaltenbacher et al 10…”

Section: Introductionmentioning

confidence: 99%

Application of LES combined with a wave equation for the simulation of noise induced by a flow past a generic side mirror

Guseva

Egorov

2022

International Journal of Aeroacoustics

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The paper presents validation results of a hybrid simulation method for aeroacoustics in turbulent flows at low Mach numbers. The hybrid method implemented in the Ansys Fluent® CFD package applies a scale-resolving turbulence model to compute the noise sources in an incompressible flow, while the noise propagation is modeled by a wave equation formulated for the acoustic potential. The selected test case deals with a flow and a sound field around a generic side view mirror of a car. The SBES model by Menter, which belongs to the class of the RANS-LES models, is used for the flow simulation. It switches to the Large Eddy Simulation (LES) mode in separated mixing layers and recirculation zone behind the mirror as well as in the following wake, where flow develops intensive turbulence and dominating noise sources. The acoustics wave equation is formulated in the model form of Kaltenbacher et al. and is applied in the time domain. The overall calculation is performed as a transient co-simulation on the same mesh using the finite-volume discretization method for both the flow and the acoustics parts. The wave equation is advanced in time using the HHT-α method. Obtained distribution of the mean wall pressure over the mirror surface closely matches the experimental one. Rich content of the resolved turbulent vortices in the separation zone and good agreement of the calculated and measured wall pressure spectra at sensor locations downstream the mirror evidence a proper LES resolution quality of noise sources. Comparison of the computed noise spectra at the remote microphones with the experimental data demonstrates the sound propagation accuracy and validates the overall aeroacoustics simulation method.

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Computational Aeroacoustics for HVAC Systems Utilizing a Hybrid Approach

Cited by 12 publications

References 13 publications

Efficient numerical simulation of the human voice

Efficient numerical simulation of the human voice

Hybrid Aeroacoustic Computations: State of Art and New Achievements

Application of LES combined with a wave equation for the simulation of noise induced by a flow past a generic side mirror

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