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Time-dependent difference theory for noise propagation in a two-dimensional duct. [of a turbofan engine
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Baumeister, K. J. |
| Copyright Year | 1979 |
| Description | A time dependent numerical formulation was derived for sound propagation in a two dimensional straight soft-walled duct in the absence of mean flow. The time dependent governing acoustic-difference equations and boundary conditions were developed along with the maximum stable time increment. Example calculations were presented for sound attenuation in hard and soft wall ducts. The time dependent analysis were found to be superior to the conventional steady numerical analysis because of much shorter solution times and the elimination of matrix storage requirements. |
| File Size | 609414 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19800004568 |
| Archival Resource Key | ark:/13960/t2798zx9p |
| Language | English |
| Publisher Date | 1979-01-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Noise Propagation Gas Dynamics Wave Equations Acoustic Velocity Finite Element Method Harmonic Functions Time Dependence Wave Propagation Nozzle Flow Finite Difference Theory Turbofan Engines Mathematical Models Gauss Equation Mach Number Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
