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Several computational aeroacoustics solutions for the ducted diaphragm at low mach number melanie piellard delphi thermal systems.
| Content Provider | CiteSeerX |
|---|---|
| Author | Baillyy, Christophe |
| Abstract | A hybrid method of aeroacoustic noise computation based on Lighthill's Acoustic Anal-ogy is applied to investigate the noise radiated by a low Mach number ow through a ducted diaphragm. The simulation method is a two-step hybrid approach relying on Lighthill's acoustic analogy, assuming the decoupling of noise generation and propagation. The rst step consists of an incompressible Large Eddy Simulation of the turbulent ow eld, during which aerodynamic quantities are recorded. In the second step, a variational formulation of Lighthill's Acoustic Analogy using a nite element discretization is solved in the Fourier space. The sensitive steps consisting in computing and transferring source term data from the uid mesh to the acoustic mesh are reviewed. Indeed, as uid and acoustic meshes have dierent constraints due to the dierent wavelengths to be resolved, interpolation is required. The method is applied to a three-dimensional ducted diaphragm with low Mach number ow. Although the conguration is symmetric, this study exhibits a very complex three-dimensional ow behavior. Four dierent aerodynamic solutions are compared with the Direct Noise Computation performed by Gloerfelt & Lafon. Good agreement is found in terms of mean ow as well as on instantaneous behavior and turbulent intensities. Acous-tic computations are performed with dierent mesh renement and interpolation methods. Comparison with literature data on similar cases shows the method relevancy. I. |
| File Format | |
| Access Restriction | Open |
| Subject Keyword | Ducted Diaphragm Several Computational Aeroacoustics Solution Low Mach Number Ow Acoustic Mesh Acoustic Analogy Instantaneous Behavior Uid Mesh Three-dimensional Ducted Diaphragm Method Relevancy Dierent Wavelength Variational Formulation Dierent Aerodynamic Solution Dierent Mesh Renement Mean Ow Nite Element Discretization Similar Case Fourier Space Hybrid Method Interpolation Method Noise Generation Dierent Constraint Source Term Data Complex Three-dimensional Ow Behavior Second Step Acoustic Anal-ogy Acous-tic Computation Good Agreement Sensitive Step Two-step Hybrid Approach Aeroacoustic Noise Computation Turbulent Ow Eld Aerodynamic Quantity Direct Noise Computation Incompressible Large Eddy Simulation Literature Data Rst Step Turbulent Intensity Gloerfelt Lafon Simulation Method |
| Content Type | Text |
