Effects of Aeroelastic Walls on the Aeroacoustics in Transonic Cavity Flow
Journal article, 2022

The effects of elastic cavity walls on noise generation at transonic speed are investigated for the generic M219 cavity. The flow is simulated with the Spalart–Allmaras (SA) improved delayed detached-eddy simulation (IDDES) turbulence model in combination with a wall function. The structural analysis software uses a modal formulation. The first 50 structural normal mode shapes are included in the simulation, spanning frequencies of 468–2280 Hz. Results are compared with those from a reference simulation with rigid cavity walls. A spectral analysis of pressure fluctuations from a microphone array above the cavity evinces a distinct tone at 816 Hz, which is absent in the reference simulation. Furthermore, the power of the 4th Rossiter mode at 852 Hz is depleted, implying a significant energy transfer from the fluid to the structure. Spectral proper orthogonal decomposition (SPOD) is employed for analyses of cavity wall pressure fluctuations and wall displacements. The SPOD mode energy spectra show results consistent with the spectra of the microphone array with respect to the tone at 816 Hz and the depletion of the energy at the 4th Rossiter mode. Furthermore, the SPOD mode energy spectra show energy spikes at additional frequencies, which coincide with structural eigenfrequencies.




cavity flow

hybrid RANS-LES


Stefan Nilsson

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Huadong Yao

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Anders Karlsson

Saab Aeronautics AB

Sebastian Arvidson

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics


22264310 (eISSN)

Vol. 9 11 716

Multidisciplinary advanced computations: Fluid dynamics, Aeroacoustics, Structural dynamics (MultFAS)

VINNOVA (PO1600297547), 2019-11-01 -- 2022-10-31.

Design of the aerodynamic properties of an electric aircraft

AoA Transport, 2021-01-01 -- 2022-12-31.

AoA Energy, 2021-01-01 -- 2022-12-31.

Strategic research project on Chalmers on hydro- and aerodynamics

The Chalmers University Foundation, 2019-01-01 -- 2023-12-31.

Areas of Advance



Subject Categories

Applied Mechanics

Other Physics Topics

Fluid Mechanics and Acoustics


C3SE (Chalmers Centre for Computational Science and Engineering)



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