Fundamental Aeroacoustics Capabilities of the Lattice-Boltzmann Method

Crouse, Bernd; Freed, David; Balasubramanian, G.; Lew, Phoi-Tack; Mongeau, Luc

doi:10.2514/6.2006-2571

Cited by 26 publications

(16 citation statements)

References 21 publications

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“…15 To account for the presence of solid boundaries in the simulation, the no-slip boundary condition is imposed by utilizing a simple particle bounce back and specular reflection process on a solid surface. 19 In addition, an improved volumetric boundary scheme for arbitrary geometries has been devised and implemented to accurately control and govern the momentum flux across the boundary.…”

Section: · ͑3͒mentioning

confidence: 99%

“…The use of LBM for acoustics is rather recent, with most applications limited to Mach numbers below M = 0.2. Among the recent works pertaining to aeroacoustics are by Ricot et al 15 on fundamental acoustic studies and Seror et al 16 on the noise generated by a detailed-geometry aircraft landing gear. Yu and Girimaji 17 applied an LBM-LES technique to study several low aspect-ratio rectangular turbulent jets.…”

Section: Introductionmentioning

confidence: 99%

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Noise prediction of a subsonic turbulent round jet using the lattice-Boltzmann method

Lew

Mongeau

Lyrintzis

2010

The Journal of the Acoustical Society of America

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The lattice-Boltzmann method ͑LBM͒ was used to study the far-field noise generated from a Mach, M j = 0.4, unheated turbulent axisymmetric jet. A commercial code based on the LBM kernel was used to simulate the turbulent flow exhausting from a pipe which is 10 jet radii in length. Near-field flow results such as jet centerline velocity decay rates and turbulence intensities were in agreement with experimental results and results from comparable LES studies. The predicted far field sound pressure levels were within 2 dB from published experimental results. Weak unphysical tones were present at high frequency in the computed radiated sound pressure spectra. These tones are believed to be due to spurious sound wave reflections at boundaries between regions of varying voxel resolution. These "VR tones" did not appear to bias the underlying broadband noise spectrum, and they did not affect the overall levels significantly. The LBM appears to be a viable approach, comparable in accuracy to large eddy simulations, for the problem considered. The main advantages of this approach over Navier-Stokes based finite difference schemes may be a reduced computational cost, ease of including the nozzle in the computational domain, and ease of investigating nozzles with complex shapes.

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Section: · ͑3͒mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Noise prediction of a subsonic turbulent round jet using the lattice-Boltzmann method

Lew

Mongeau

Lyrintzis

2010

The Journal of the Acoustical Society of America

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“…Some fundamental aeroa-coustic capabilities of the scheme have been studied before, such as wave propagation and compressible behavior. 26,27 In these cases the code has proven itself capable of correctly simulating these acoustics related problems. Examples of the use of the Lattice Boltzmann scheme in acoustics are simulation of radiation from waveguides, 28 acoustic pulses in flows and duct aeroacoustics, 29 and side branches.…”

Section: B Numerical Scheme; the Lattice Boltzmann Methodsmentioning

confidence: 99%

Investigation of higher spanwise Helmholtz resonance modes in slender covered cavities

Jong

Bijl

2010

The Journal of the Acoustical Society of America

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Cavity aeroacoustic noise is relevant for aerospace and automotive industries and widely investigated since the 1950s. Most investigations so far consider cavities where opening length and width are of similar scale. The present investigation focuses on a less investigated setup, namely cavities that resemble the door gaps of automobiles. These cavities are both slender ͑width much greater than length or depth͒ and partially covered. Furthermore they are under influence of a low Mach number flow with a relatively thick boundary layer. Under certain conditions, these gaps can produce tonal noise. The present investigation attempts to reveal the aeroacoustic mechanism of this tonal noise for higher resonance modes. Experiments have been conducted on a simplified geometry, where unsteady internal pressures have been measured at different spanwise locations. With increasing velocity, several resonance modes occur. In order to obtain higher mode shapes, the cavity acoustic response is simulated and compared with experiment. Using the frequency-filtered simulation pressure field, the higher modes shapes are retrieved. The mode shapes can be interpreted as the slender cavity self-organizing into separate Helmholtz resonators that interact with each other. Based on this, an analytical model is derived that shows good agreement with the simulations and experimental results.

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“…Some fundamental aeroacoustic capabilities of the scheme have been studied before, such as wave propagation and compressible behavior. 25,26 In these cases the code has proven itself capable of correctly simulating these acoustics related problems. Examples of the use of the Lattice Boltzmann scheme in acoustics are simulation of radiation from waveguides,, 27 acoustic pulses in flows and duct aeroacoustics, 28 and side branches.…”

Section: Numerical Setup: Lattice Boltzmann Methodsmentioning

confidence: 99%

Experimental and Numerical Investigation of the Flow-Induced Resonance of Slender Deep Cavities that Resemble Automotive Door Gaps

Jong

Bijl

2010

16th AIAA/CEAS Aeroacoustics Conference

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Cavity aeroacoustic noise is relevant for aerospace and automotive industries and widely investigated since the 1950's. Most investigations so far consider cavities where opening length and width are of similar scale. The present investigation focuses on a less investigated setup, namely cavities that resemble the door gaps of automobiles. These cavities are both slender (width much greater than length or depth) and partially covered. Furthermore they are under influence of a low Mach number flow with a relatively thick boundary layer. Under certain conditions, these gaps can resonate with the flow.The present investigation attempts to reveal the aeroacoustic mechanism of this tonal noise. Also the ability to simulate the resonance behavior using the Lattice Boltzmann method (LBM) is evaluated Experiments have been conducted on simplified geometries, where hotwire, high speed PIV and microphone measurements have been used. The opening geometry and boundary layer properties have been varied. Using the PIV results, the observed influences of the opening geometry on base mode resonance are explained.With increasing velocity, several resonance modes occur. In order to obtain higher mode shapes, the cavity acoustic response is simulated using LBM and compared with experiment. Using the frequency-filtered simulation pressure field, the higher modes shapes are retrieved. Based on this an analytical model is derived that shows good agreement with the simulations and experimental results.LBM based flow simulations show that the turbulent fluctuation content of the boundary layer is important to correctly simulate the flow induced resonance response. When unsteady fluctuations are implemented in the inlet of the simulation, the cavity excitation shows good resemblance with experiment.

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Fundamental Aeroacoustics Capabilities of the Lattice-Boltzmann Method

Cited by 26 publications

References 21 publications

Noise prediction of a subsonic turbulent round jet using the lattice-Boltzmann method

Noise prediction of a subsonic turbulent round jet using the lattice-Boltzmann method

Investigation of higher spanwise Helmholtz resonance modes in slender covered cavities

Experimental and Numerical Investigation of the Flow-Induced Resonance of Slender Deep Cavities that Resemble Automotive Door Gaps

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