Numerical Analysis of Parameters Affecting Turbulent Boundary Layer Trailing-Edge Noise

Document Type : Research Article

Authors

1 PhD Student, Department of Mechanical Engineering, Yazd University, Iran

2 Mech. Eng. Dept, Faculty of Engineering, Yazd University, IRAN

3 Ph.D. Graduate, Aero. Eng., Shahid Sattari Aeronautical University of Science and Technology, Tehran, Iran

Abstract

In the present study, one of the most important mechanisms of aerodynamic noise generation is investigated numerically. The Large-eddy simulation approach used to solve the unsteady flow equations of the turbulent boundary layer with Mach number 0.06 over a flat plate of length 30 cm. Lund's inflow boundary model used to reduce computational cost. In order to evaluate the parameters affecting trailing edge noise (including surface pressure spectra, the spanwise length scale of the surface pressure fluctuations and eddy convection velocity), data of surface pressure fluctuations values in different points over the flat plate surface are collected using the probe tool in OpenFOAM software. Based on the calculated parameters affecting the trailing edge noise, the far-field noise is predicted using the analytical Amiet-Roger model. The results showed that the numerical solution method used in this study is capable of predicting the effective parameters on the trailing edge noise with a reasonable computational cost. Studying the spectral parameters affecting the turbulent boundary layer trailing edge noise showed that prediction and direct estimation of these parameters can be used to predict the far-field noise propagation. Moreover, these parameters can provide proper information on the physics of the flow and dimensions and lifetime of turbulent boundary layer vortex structures.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 1 (Special Issue)
April 2021
Pages 437-452

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