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Numerical Models for Internal Sound Pressure Level Prediction
Luca Fenini, Stefano Malavasi

Last modified: 2018-04-18

Abstract


In this work the noise produced by a perforated plate (orifice) inside a pipe is predicted through a numerical hybrid approach for Computational Aero-Acoustics based on the resolution of different acoustic propagation equations APE coupled with fluid-dynamic simulations and synthetic generation of the turbulent fluctuations.

The objective is the study of the fluid-dynamic and the noise generation mechanisms of jets (and their reciprocal interaction) for application on more complex flow-control devices.

Under the assumption of isentropic flow, a system of equations APE for acoustic pressure and acoustic particle velocity can be derived as one of the most accurate model for taking into account the convection and the refraction of the acoustic wave due to the mean sheared flow.

The results are compared with the ones obtained from other APE formulations (derived with additional assumptions or with different models for the source term) and from LES direct simulations. The comparisons between different APE formulations reveals the incidence of refraction and convection on the sound pressure level inside the pipeline. On the other hand, the LES can be considered as a reference for the calibration of the numerical models for such an application.


Keywords


computational fluid dynamics; computational aero-acoustics; acoustic propagation equations

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