Aeroacoustic Investigation of a Cavity with and without Doors by Delayed Detached Eddy Simulation

Abstract

In the present study, an effort was made to numerically investigate rectangular cavity aeroacoustics with and without doors. The simulation was performed on an open cavity with an aspect ratio of 5:1:1 at Mach 0.85 using the delayed detached eddy simulation (DDES) approach based on the Spalart-Allmaras model. Two cavity configurations, a clean cavity and a cavity with doors, were modeled. The results obtained from the clean cavity were compared with the experimental sound pressure levels (SPL) and the root mean square for the pressures applied. Furthermore, comparisons of frequencies were made using a modified semi-empirical Rossiter formula. The simulation using DDES precisely predicted the pressure fluctuation and the results matched the experiment quite well. The SPLs at the rear of the cavity were much higher than those in the front due to the instability of the shear layer impinging on the rear wall. Comparisons of DDES for the clean cavity and the doors-on cavity revealed that the SPLs inside the cavity as well as the magnitude of tones are amplified by the side doors. The main focus of this investigation was to obtain a better understanding of the open cavity acoustic resonance phenomenon and investigate the effects of cavity doors on the SPL.

RETRACTED: Active aerodynamic noise control research for supersonic aircraft cavity by nonlinear numerical simulation

“…3 At present, large eddy simulation (LES), detached eddy simulation (DES) and Reynolds-averaged Navier-Stokes/Large Eddy Simulation (RANS/LES) are common calculation methods applied for the supersonic flow field and aerodynamic noise. [4][5][6][7][8][9][10] However, for high Reynolds number flows, the calculation cost of the above methods is still very high. For the RANS/LES, it particularly dependent on the subgrid scale model dissipation, meanwhile, there are difficulties in transferring the data of statistical turbulence energy from RANS to LES, and all of these make this approach expensive and uncertain for the supersonic aerodynamic noise computation.…”

Aeroacoustic Investigation of Passive and Active Control on Cavity Flowfields Using Delayed Detached Eddy Simulation

“…According to the previous research [5,9,15], the sound pressure level in the cavity has four distinct peaks, and the four modes are recognised as tone noise in which the second-order and third-order modes are the dominant modes. First of all, it can be seen from Figure 5 that the three passive control methods obtained by the DDES method can significantly suppress the noise level in the upstream and downstream of the cavity, especially reducing the magnitude of the second-order mode.…”

Nonlinear Numerical Simulation for Oscillating Pressure in Cavity and Passive Control Research

“…Recent effort is made by a hybrid RANS/LES method known as Detached Eddy Simulation (DES) which is a compromising method between URANS and DNS. It is proposed by Spalart et al [12] and widely applied [13][14][15][16]. Batten et al [17] point out that these hybrid methods remain expensive and uncertain because the current methods largely rely on the dissipation of the subgrid scale model, and a substantial difficulty exists in transferring statistical turbulence energy data between RANS and LES regions [18].…”