Validation of a CAA formulation based on Lighthill's Analogy using AcuSolve and ACTRAN/LA on an Idealized Automotive HVAC Blower and on an axial fan

Sandboge, Robert; Caro, Stéphane; Ploumhans, Paul; Ambs, Raymond; Schillemeit, Balthasar; Washburn, Karl B.; Shakib, Farzin

doi:10.2514/6.2006-2692

Cited by 8 publications

(6 citation statements)

References 10 publications

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“…75 In CAA, Lighthill's wave equation in combination with a hybrid computational procedure based on incompressible flow simulations has been frequently used for subsonic flows, e.g. technical applications, 6,8,76,77 human phonation, 78-81 ground mobility applications, 5,7,9 and airframe noise at low Mach numbers with comparison to direct simulation of flow and sound. 82 At higher Mach numbers, a compressible flow simulation constitutes the basis for the acoustic simulation.…”

Section: Lighthill's Analogymentioning

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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Section: Lighthill's Analogymentioning

confidence: 99%

Hybrid Aeroacoustic Computations: State of Art and New Achievements

Schoder

2019

J. Theor. Comp. Acout.

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“…For application to external aeroacoustic problems, the computational domain is not bounded and the pressure oscillations at far distance from the noise sources should be satisfied by the Sommerfeld radiation conditions. 34 This is implemented through the infinite elements. More details on the numerical implementation can be found in the ACTRAN 13.0 User's Guide.…”

Section: Aerodynamic and Aeroacoustic Analysesmentioning

confidence: 99%

Aerodynamic and aeroacoustic optimization for design of a forward-curved blades centrifugal fan

Heo

Kim

Seo

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper presents a multidisciplinary optimization procedure for enhancing the aerodynamic and aeroacoustic performance of a forward-curved blade centrifugal fan for residential ventilation. Flow analysis in a forward-curved blade centrifugal fan was conducted by solving three-dimensional steady and unsteady Reynolds-averaged Navier-Stokes equations using the shear stress transport turbulence model. On the basis of the aerodynamic sources extracted from the unsteady flow, aeroacoustic analysis was implemented in a finite/infinite element method by solving the variational formulation of Lighthill's analogy. Experiments were performed to obtain aerodynamic and aeroacoustic measurements for validation of numerical results. The single-and multi-objective optimizations were performed sequentially. The single-objective optimization was carried out to improve the efficiency of the fan using a radial basis neural network surrogate model with four design variables defining the scroll cutoff angle, scroll diffuser expansion angle, diameter ratio of the impeller, and blade exit angle. Multi-objective optimization based on the single-objective optimization result was carried out to simultaneously improve the efficiency and reduce the sound pressure through a hybrid multi-objective evolutionary algorithm coupled with a response surface approximation surrogate model with two design variables defining the scroll cutoff radius and distance. These objective functions were accessed numerically through threedimensional aerodynamic and aeroacoustic analyses at the design points sampled by Latin hypercube sampling in the design space. Arbitrary selected optimum designs in the Pareto-optimal solutions yielded significant increases in efficiency and decreases in the sound pressure level compared to the reference design.

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“…It has been gradually developed and applied for nearly a decade. 18,20,26,27 Variational formulation of Lighthill's analogy noise source is obtained by CFD. 2 denotes the computational domain outside the flow field, in which the strength of noise source is zero.…”

Section: Fem Simulation Of Aerodynamic Noisementioning

confidence: 99%

Study on the aerodynamic noise of internal flow of regenerative flow compressors for a fuel-cell car

Kang

Zuo

Wei

2013

Proceedings of the Institution of Mechanical Engineers, Part C:

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The regenerative flow compressor used in fuel-cell cars generates high aerodynamic noise, which is the main source of noise. Compared with the research on centrifugal or axial turbomachinery, research on the noise of regenerative flow compressors is far from adequate. This paper presents the on-going work on it at Tongji University based on both experimental and computational works. In this study, a three-dimensional unsteady computational fluid dynamic model of the compressor was constructed with the large eddy approach. The pressure fluctuation, vortex noise source and Ffowcs William-Hawkings (FW-H) method were used to analyze the characteristics of the aerodynamic noise sources. Additionally, the far-field aerodynamic noise generated by the internal flow of the compressor was predicted using the aeroacoustic finite element method. The simulation results were validated with the experimental data. It was found that combining the fluid dynamic model and aeroacoustic finite element analysis promising results for aerodynamic noise prediction of compressors could be produced. The effects of the impeller parameters on the aerodynamic noise of the compressor were also studied.

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Validation of a CAA formulation based on Lighthill's Analogy using AcuSolve and ACTRAN/LA on an Idealized Automotive HVAC Blower and on an axial fan

Cited by 8 publications

References 10 publications

Hybrid Aeroacoustic Computations: State of Art and New Achievements

Hybrid Aeroacoustic Computations: State of Art and New Achievements

Aerodynamic and aeroacoustic optimization for design of a forward-curved blades centrifugal fan

Study on the aerodynamic noise of internal flow of regenerative flow compressors for a fuel-cell car

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