Prediction of the Sound radiated from Low-Mach Internal Mixing Nozzles with Forced Mixers using the Lattice Boltzmann Method

Habibi, Kaveh; Gong, Hao; Najafi­-Yazdi, Alireza; Mongeau, Luc

doi:10.2514/6.2013-2143

Cited by 11 publications

(10 citation statements)

References 32 publications

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“…The results presented in this study complement those from the previous study by the authors 40 . The sound produced by flow through internal mixing nozzles for high Mach set points were simulated using a novel entropic LBM capable of resolving Mach numbers up to the M a =0.95.…”

Section: Closing Remarkssupporting

confidence: 94%

“…The effect of lobed mixers on noise reduction and parametric studies on the lobe number, penetration depth scalloping, and thermal effects were investigated in previous studies by the author. 40,41 Quantitative results indicated a significant difference between the sound directivity of the lobed-shaped and confluent mixers. Band-passed filtering of the far-field pressure spectrum was performed to evaluate the effects of mixer shape on sound directivity in different frequency bands.…”

Section: Resultsmentioning

confidence: 96%

“…In our previous studies, 40,41 the conventional D3Q19 LBM coupled with the RNG k-ε turbulence was used for preliminary studies at reduced engine set points and found to capture most of the physical sound generation phenomena including near-field turbulent characteristics and far-field sound for the relatively low-Mach operating condition. The Exa PowerFLOW 4.3d solver was used for the previous low-Mach set points.…”

Section: Introductionmentioning

confidence: 99%

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Aeroacoustic study of Internal Mixing Nozzles with Forced Lobed Mixers using a High-Mach Subsonic Lattice Boltzmann Scheme

Habibi

Mongeau

Casalino³

et al. 2014

20th AIAA/CEAS Aeroacoustics Conference

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Numerical simulation of the transient compressible flow through lobed mixers inside turbofan engine nozzles was performed. A novel entropic Lattice Boltzmann (LB) scheme was used for the computational studies. The very large eddy simulation scheme (LBM-VLES) was used to capture sub-grid scale flow structures. The sound generation process was investigated using the porous Ffwocs William-Hawkings (FW-H) surface integral method. A contoured dual-stream nozzle with a standard 12-lobed mixer (12CL) was selected as a test case to validate the LBM simulation. A detailed model of the mixer and the nozzle was concurrently created to simulate both the internal flow through the mixer and the external jet plume. All operating boundary conditions were imposed based on available measured data for the same mixer geometry. The transient and mean flow characteristics of the flow field were obtained both inside the nozzle and within the jet plume. The transient behavior of the streamwise vortices at the nozzle exit was visualized and quantified. The Reynolds number based on nozzle exit diameter was 2.02×10 6 and the acoustic Mach number reached 0.94. Both near field and far field results and trends were in good agreement with experimental data. Specifically the predicted averaged velocity field was within the range of measure values. The overall radiated sound pressure was within 2-3dB of measured sound at all directional angles.Nomenclature c i = particle velocity f = particle distribution function f i eq = equilibrium distribution function D J = jet diameter M = Mach number (M=U /a) P = pressure P a = ambient pressure Re D = jet Reynolds number (Re D = U j D j / υ j ) T = temperature T a = ambient temperature t = time * Corresponding Author, Research assistant -AIAA member, Email: kaveh.habibi@mail.mcgill.ca. † Professor, Senior AIAA member ‡ Technical director, AIAA member § Senior physics validation Engineer, AIAA member Downloaded by ROKETSAN MISSLES INC. on February 8, 2015 | http://arc.aiaa.org |

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Section: Closing Remarkssupporting

confidence: 94%

Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Aeroacoustic study of Internal Mixing Nozzles with Forced Lobed Mixers using a High-Mach Subsonic Lattice Boltzmann Scheme

Habibi

Mongeau

Casalino³

et al. 2014

20th AIAA/CEAS Aeroacoustics Conference

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“…22 These values scale the contribution of the eddy viscosity in τ ef f , allowing structures which can be resolved by the grid to be developed and persist without numerical damping. The turbulence model equations are solved in the same grid as the LBM, but with a modified Lax-Wendroff explicit second order finite difference scheme.…”

Section: Iia Governing Equationsmentioning

confidence: 99%

“…The molecular relaxation time is replaced by an effective turbulent relaxation time, including the eddy viscosity effects. 22 The turbulence model used is a modification of the two-equation renormalization group (RNG) k − . 27,25 The corrected relaxation time scale is,…”

Section: Iia Governing Equationsmentioning

confidence: 99%

Assessment of Jet-plate Interaction Noise Using the Lattice Boltzmann Method

Silva

Deschamps

Silva

et al. 2015

21st AIAA/CEAS Aeroacoustics Conference

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A numerical investigation of a jet interacting with a flat plate was conducted using a LBM-VLES approach. Simulations were conducted with a round jet under a large flat plate, with jet Mach number 0.3 (ReD = 2.6 × 10 5 ) and 0.5 (ReD = 4.3 × 10 5 ). The aim was to observe the capabilities of the method to investigate jet installation effects. Far-field SPL data were obtained using the Ffowcs-Williams and Hawkings (FW-H) surface integral method with permeable and solid surfaces. The position of the plate relative to the nozzle was varied and the effects on the far-field noise were observed. Results showed good agreement with experimental data, up to StD = 2. Noise data obtained with solid surfaces suggested that the plate pressure field contained the main information of the installation effect. Results highlighted the potentialities of the code for investigating the noise generation from jetsurface interaction.

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Numerical and experimental investigation of a beveled trailing-edge flow field and noise emission

Velden

Pröbsting

Zuijlen

et al. 2016

Journal of Sound and Vibration

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Prediction of the Sound radiated from Low-Mach Internal Mixing Nozzles with Forced Mixers using the Lattice Boltzmann Method

Cited by 11 publications

References 32 publications

Aeroacoustic study of Internal Mixing Nozzles with Forced Lobed Mixers using a High-Mach Subsonic Lattice Boltzmann Scheme

Aeroacoustic study of Internal Mixing Nozzles with Forced Lobed Mixers using a High-Mach Subsonic Lattice Boltzmann Scheme

Assessment of Jet-plate Interaction Noise Using the Lattice Boltzmann Method

Numerical and experimental investigation of a beveled trailing-edge flow field and noise emission

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