Numerical Simulation of Edge Noise Using a Method Based on Synthetic Turbulence
- Authors: Balakireva N.V.1
-
Affiliations:
- Gaponov-Grekhov Institute of Applied Physics of the RAS
- Issue: Vol 88, No 5 (2024)
- Pages: 758-777
- Section: Articles
- URL: https://journals.rcsi.science/0032-8235/article/view/280967
- DOI: https://doi.org/10.31857/S0032823524050084
- EDN: https://elibrary.ru/JPIRMW
- ID: 280967
Cite item
Abstract
An approach to the numerical modeling of broadband noise excited by turbulent fluid pulsations in the presence of an elastic body using a method based on synthetic turbulence is presented. The most common methods aimed at solving this problem involve determining noise emission as a result of solving the Helmholtz equation with sources in the form of the Lighthill tensor, previously determined in the hydrodynamic part of the problem using eddy-resolving turbulence models. These methods require a large amount of computation, which in the case of real technical applications leads to almost impossible requirements for computing resources. A reduction in the amount of calculations can be achieved for the class of problems in which continuous flow is implemented. In this case, hydrodynamic fields determined using a relatively simple Reynolds averaging of the Navier–Stokes equations can be used as initial data instead of directly determining velocity fluctuations in the computational domain using eddy-resolving methods.
In the presented method, velocity pulsations are generated based on information about averaged hydrodynamic fields, by spatial filtering of white noise with given correlation characteristics. As a result, an express assessment of the noise flow around a body is reduced to finding the radiation power density of elementary streams of current near the inhomogeneity of the streamlined surface, using data on the velocity vectors obtained as a result of solving a hydrodynamic problem, in the approximation of an incompressible fluid, as well as the transfer coefficient “source of volumetric acceleration – pressure”, which is determined by the reciprocity method. The transmission coefficient characterizes the geometry of the streamlined body, its mechanical properties and the properties of the medium in which acoustic radiation propagates. The method allows you to localize areas with the most intense noise emission, as well as interpret the results obtained by analyzing the features of the hydrodynamic flow and the properties of the elastic structure. A verification of the method is presented using the example of the problem of noise emission from a fragment of a real technical structure flowing around a fluid flow.
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About the authors
N. V. Balakireva
Gaponov-Grekhov Institute of Applied Physics of the RAS
Author for correspondence.
Email: balakireva@ipfran.ru
Russian Federation, Nizhny Novgorod
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