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Hybrid computational aeroacoustics based on compressible flow data at low Mach numbers
| Content Provider | Semantic Scholar |
|---|---|
| Author | Schoder, Stefan Tóth, Flórián Kaltenbacher, Manfred |
| Copyright Year | 2017 |
| Abstract | Lighthill's acoustic analogy transforms the compressible Navier-Stokes equation into an exact inhomogeneous wave equation. When extracting source terms from a compressible ow simulation, the results already incorporate acoustic wave propagation, corrupting the source term computation. Hence, acoustic analogies based on incompressible ow data are preferred at low Mach numbers. These methods implicitly describe a one-way coupling from ow structures to acoustic waves. However, some practical applications (e.g. a cavity with a lip[1] or resonator like structures) seek for compressible simulation, since acoustic feedback mechanisms excite ow structures. At low Mach numbers we identify the origin of the incompressible part of the velocity eld as the incompressible solution of the ow eld and the remaining part as a compressible disturbance. Based on the compressible ow simulation, the acoustic propagation is computed in an extra step. At low Mach numbers, the incompressible ow structures are the main acoustic sources. Therefore, the compressible ow eld is separated by the Helmholtz decomposition |
| Starting Page | 687 |
| Ending Page | 688 |
| Page Count | 2 |
| File Format | PDF HTM / HTML |
| DOI | 10.1002/pamm.201710312 |
| Alternate Webpage(s) | https://publik.tuwien.ac.at/files/publik_263175.pdf |
| Alternate Webpage(s) | https://doi.org/10.1002/pamm.201710312 |
| Volume Number | 17 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
