| Autor: |
Fang Wang, Qiu Hong Liu, Jin Sheng Cai |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
Applied Mechanics and Materials. 378:19-25 |
| ISSN: |
1662-7482 |
| DOI: |
10.4028/www.scientific.net/amm.378.19 |
| Popis: |
A computational method is presented to evaluate non-compact noise produced by compressible flow interacting with arbitrarily shaped solid objects. In conjunction with compressible calculation, hybrid computational aeroacoustics method is used to develop noise calculation. Scattering effect induced by non-compact surfaces is the prime objective to study in the present research, the fluctuations of flow variables are decomposed into hydrodynamic component mainly produced by fluid flow and acoustic component mainly produced by noise propagation. Non-compact integral surface is divided into enough fine elements, and scattered pressure on body surface is firstly captured by acoustic calculation. The acoustic noise of two dimensional stationary circular cylinders at low Mach number is considered with diameter D=0.019m (Re=90000) and D=1m (Re=100). Numerical results indicate that the noise predicated by the present method is as accurate as noise directly computed by Curles equations at low frequency, the total noise of cylinder model has a dipole-like directivity, but a petal-like pattern at high frequency when scattering effects gradually strengthen. This method exactly captures scattered noise produced by noncompact bodies, and the influence of scattered noise with increased frequency is evaluated simultaneously in this paper. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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