Original scientific paper

https://doi.org/10.17559/TV-20141231143143

Numerical prediction of aerodynamic noise generated from missile for low Mach number flows

Vladimir Jazarević orcid.org/0000-0002-9882-5822 ; University of Belgrade, Marka Oreškovića 12, 11000 Belgrade, Serbia
Boško Rašuo orcid.org/0000-0002-0912-6844 ; University of Belgrade, Faculty of Mechanical Engineering, Aeronautical Department, Kraljice Marije 16, 11000 Belgrade, Serbia

Abstract

Paper describes numerical prediction of aerodynamic noise generated from the missile. Simulation of turbulent flow is done solving incompressible Navier-Stokes equation, where turbulence is modelled with the orthogonal subgrid scale (OSGS) method with dynamical subscales. Because of comparison, the same simulation is done using the LES (Large Eddy simulation). It is shown how simulation of turbulent flow affects the prediction of acoustic sources calculated using Lighthill's analogy. Translation from time to frequency domain is done through DFT (Direct Fourier Transform), which gives smaller usage of memory. Acoustic sources are used in inhomogeneous Helmholtz equation to simulate pressure wave propagation in the domain. It is shown that OSGS with dynamical subscales gives better representation of the spectrum. Overall, better prediction of energy transfer across large and small eddies will give better allocation and presentation of acoustics sources. These sources will change wave propagation of the pressure in acoustic field.

Keywords

aeroacoustics; direct Fourier transform; inhomogeneous Helmholtz equation; Litghill’s analogy; noise; orthogonal SGS method with dynamical subscales

Hrčak ID:

183021

URI

https://hrcak.srce.hr/183021

Publication date:

15.6.2017.

Article data in other languages: croatian

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