| Autor: |
Mancini, S., Astley, R.J., Gabard, G., Sinayoko, S., Tournour, M |
| Jazyk: |
angličtina |
| Rok vydání: |
2015 |
| Popis: |
The focus of this study is to present the limitations of a hybrid numerical method for the predictionof sound propagation and scattering within an unbounded domain. We present a combinedFinite Element Method (FEM)/Radiating-surface approach based on a Kirchhoff’s integral formulationwith a mean flow. This work identifies the sources of numerical error inherent to thehybrid method. A potential formulation is adopted for wave propagation and the problem is setin the frequency domain. The finite element method is applied to solve the scattering problemin presence of non-uniformities. The FEM solution, combined with a Perfectly Matched Layer(PML), is mapped on a closed surface. The Kirchhoff’s radiating surface with a uniform meanflow propagates acoustic waves in free field. The problem of radiation from a monopole sourceand the scattering by a cylinder from the same source are presented as numerical examples by accountingfor a subsonic mean flow. The accuracy in the prediction of the acoustic particle velocityis critical for the efficacy of the method. The main achievement is that the detrimental effect ofthe mean flow on the pollution error can be limited by applying the hybrid method. On the otherhand, the integral formulation is exact only for a uniform mean flow. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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