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Role of hydrodynamic and acoustic pressures in trailing-edge noise using numerical and analytical approaches

Donghun Kang and Seongkyu Lee*

  • *Contact author: skulee@ucdavis.edu
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Phys. Rev. Fluids 10, 034609 – Published 27 March, 2025

DOI: https://doi.org/10.1103/PhysRevFluids.10.034609

Abstract

This study employs wall-resolved large-eddy simulation of a NACA 0012 airfoil at a Reynolds number of 400 000, a Mach number of 0.058, and zero incidence angle to investigate the fundamental mechanisms governing trailing-edge noise generation and propagation within turbulent boundary-layer flows. It utilizes wave-number-frequency decomposition and Amiet's trailing-edge noise theory to separate total pressure into two distinct components: hydrodynamic (incident) pressure and acoustic (scattered) pressure. The findings reveal that hydrodynamic pressure consists of turbulent coherent structures characterized by high-energy spectra, but they act as nonpropagating sources due to destructive interference within the streamwise correlation length. In contrast, acoustic pressure exhibits an in-phase nature that facilitates efficient sound propagation. The roles of incident and scattered pressures in Amiet's theory are compared with hydrodynamic and acoustic pressures obtained from a numerical simulation, revealing similarities in magnitude and directivity patterns.

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Phys. Rev. Fluids 10, 034609– Published 27 March, 2025
  • Received 3 August 2024
  • Accepted 10 March 2025
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