Abstract
Prediction of oscillating pressure is a key technology for cavity research. Nonlinear Acoustic Solver (NLAS) is applied to analyze aeroacoustics recently. A nonlinear numerical solver is combined with the Reynolds-averaged Navier-Stokes (RANS) method. RANS is applied to solving the flow field around a cavity, and average solution of initial turbulent statistics is obtained which contains the basic characteristics of the average flow field and statistic description of turbulence fluctuation. The source of acoustic generation is reconstructed, and the spreading of oscillating pressure is simulated precisely. According to the comparison of the cavity noise calculation and experimental results under Mach numbers 0.6, 0.85, and 1.35, it indicates that NLAS is capable to predict oscillating pressure of cavity flow from subsonic to supersonic with acceptable deviation. On this basis, the contribution to oscillating pressure suppression made by passive control such as rectangular fence (RF) and square tooth spoiler (STS) is investigated. It is found that these two passive control methods can lessen the total noise.
Highlights
Cavity structure is common in the field of aeronautics and astronautics, such as under the carriage wheel well and weapon bay
Recent effort is made by a hybrid Reynolds-averaged Navier-Stokes (RANS)/Large eddy simulation (LES) method known as Detached Eddy Simulation (DES) which is a compromising method between Unsteady Reynolds-averaged Navier-Stokes (URANS) and direct numerical simulation (DNS)
The results suggest that rectangular fence (RF) and square tooth spoiler (STS) could act as a vortex generator in the cavity flow field leading the vortex away from the cavity
Summary
Cavity structure is common in the field of aeronautics and astronautics, such as under the carriage wheel well and weapon bay. 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]. Nonlinear Acoustic Solver (NLAS) combined the advantages between conventional acoustic analogy and hybrid RANS/LES methods together It was proposed by Batten et al in 2002 [19] which could consider subgrid scale sound sources by reconstruction of turbulence physical quantities. The NLAS method is applied into research on the suppression effect of the passive control method for cavity noise
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
