|
Descripción
|
|
|---|---|
| The Direct Noise Computation (DNC) approach is challenging in Computational Aero-Acoustics (CAA) since the computation of the pressure uctuations requires the resolution of unsteady and compressible ows. Indeed, most numerical methods such as the ?nite volume and element methods face limitations to e?ciently resolve the unsteady compressible Navier-Stokes equations for turbulent ows and the computational costs is extremely high. Instead, steady-state analysis with Reynolds-Averaged Navier-Stokes (RANS) turbulence modeling is generally preferred, however this prevents from a direct computation of the noise as only the mean pressure ?eld is obtained. The use of arti?cial viscosity is also required to achieve numerical stability, which dampens the high frequency physics. The lattice-Boltzmann method (LBM) is, on another hand, extremely e?cient to deal with unsteady, low-speed compressible, and highly turbulent ows. The subsonic aeroacoustics is, thus, one of the major advantages of the method, which is steadily becoming a popular alternative to the traditional Navier-Stokes solvers. This Lagrangian method works at mesoscopic scale based on probability distribution functions to resolve the Boltzmann transport equation which, by means of the Chapman-Enskog expansion, reproduces the hydrodynamic limit and hence the compressible Navier-Stokes equations. This work aims at validating the LBM-based CFD solver XFlow on three categories of noise sources: constrictions, subsonic jets, and blu bodies. First, the numerical methodology of LBM applied to aeroacoustics will be described. Three aeroacoustics test cases used in the industry to validate CAA methods will then be studied: a duct ow past a thick ori?ce plate, a subsonic jet through straight pipe, and the ow past a 2-wheels landing gear. Finally, a conclusion on the application of LBM to aeroacoustics analysis and the results found will be drawn. | |
|
Internacional
|
Si |
|
Nombre congreso
|
22nd AIAA/CEAS Aeroacoustics Conference |
|
Tipo de participación
|
960 |
|
Lugar del congreso
|
Lyon, France |
|
Revisores
|
Si |
|
ISBN o ISSN
|
|
|
DOI
|
10.2514/6.2016-2969 |
|
Fecha inicio congreso
|
30/05/2016 |
|
Fecha fin congreso
|
01/06/2016 |
|
Desde la página
|
1 |
|
Hasta la página
|
20 |
|
Título de las actas
|
Direct Noise Computation with a Lattice-Boltzmann Method and Application to Industrial Test Cases |