Effects of multiple subcavities with floor subcavity in supersonic cavity flow

Jain, Priyansh; Sekar, Anbarasan; Vaidyanathan, Aravind

doi:10.1016/j.jppr.2023.02.003

Cited by 3 publications

(1 citation statement)

References 31 publications

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“…Their results indicate that the front wall sub-cavity contributes to suppressing cavity oscillations. In another study of Jain et al (2023), experiments were performed on a cavity with a length-to-depth ratio of two and an inlet Mach number of 1.71. Sub-cavities were added at the floor of the cavity, along with sub-cavities of a length ratio of 0.2 at the front wall and the aft wall.…”

Section: Introductionmentioning

confidence: 99%

Flow control in a confined supersonic cavity flow using subcavity

Bhaduri,

Ray,

et al. 2024

Front. Mech. Eng.

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The effects of the front wall and aft wall sub-cavities in the flow field of a confined supersonic deep cavity are numerically investigated. The turbulent simulations are carried out by deploying a finite volume-based explicit density-based solver in the OpenFOAM framework in conjunction with the k − ω SST (Shear Stress Transport) turbulence model. A cavity with a length-to-depth ratio of three placed in a confined passage is considered in the study. The freestream Mach number at the entrance of the passage is approximately 1.71. The addition of the sub-cavity of lengths ranging between 0.2 and 0.3 times the length of the main cavity in the front wall and the aft wall, significantly affects the frequencies of cavity oscillations as obtained from the spectral signature. The front wall sub-cavity of length ratio 0.2 reduces the dominant frequency by almost 60 percent as compared to the baseline cavity. The analysis and comparison of the flow field using the numerical schlieren in both configurations reveal a significant alteration in the flow field. The flow visualization provides a distinct understanding of the attenuation and enhancement of pressure oscillations obtained through spectral analysis in the presence of sub-cavities.

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Section: Introductionmentioning

confidence: 99%

Flow control in a confined supersonic cavity flow using subcavity

Bhaduri,

Ray,

et al. 2024

Front. Mech. Eng.

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Lagrangian approach for analysis of acoustic energy transport in open cavity flows

Chen,

Liu,

et al. 2024

Physics of Fluids

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The energy transport in aero-acoustics is investigated in the Lagrangian frame. First, based on finite-time Lyapunov exponent (FTLE) and momentum potential theory, a Lagrangian approach is proposed to identify transport barriers of acoustic energy. Specifically, the method, named relative flux gradient (RFG), is presented in detail. Then, to verify the method, it is applied to analytical fields, showing that it could reveal the wavefronts and energy transport barriers depending on the time interval of computation. Moreover, RFG is applied to analyze a simulated flow field of an open cavity flow, and the results are compared with the Lagrangian coherent structures identified by FTLE, demonstrating great similarity. Importantly, the differences between the structures are further analyzed, illustrating several transport channels that correspond to the Rossiter mode and showing a complex interaction between acoustic and vorticity modes. Finally, the relationship between the identified transport barriers and the acoustic behaviors in Eulerian frame is studied in detail. The results show that the transport barriers identified by RFG significantly impact the orbits in phase space, and in particular, RFG has the potential to illustrate and analyze the transport of acoustic energy in complex flow fields in a quantitative way: one method for direct analysis of acoustic phenomena in complex flow regions.

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Effects of confinement, impinging shock deflection angle, and Mach number on the flow field of a supersonic open cavity

Bhaduri,

Sugarno,

2024

Physics of Fluids

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Cavities exhibit inherent self-sustaining oscillations driven by the coupling between their hydrodynamic and acoustic properties. In practical applications, cavities are often placed within confinements that introduce compression waves, significantly influencing their primary flow characteristics. The oscillations in cavities have widespread applications, such as in fuel–air mixing, heat exchangers, and landing gears. However, when resonance occurs, these oscillations can lead to structural failures. Therefore, understanding cavity oscillations under diverse geometrical configurations and flow conditions is essential. The present study examines the impact of top wall confinement on an open cavity with a length-to-depth ratio (L/D) ratio of 3 at Mach 1.71, along with the effects of varying deflection angles on flow characteristics and the influence of an increased Mach number on configurations with the highest and lowest oscillation frequencies. A three-dimensional numerical investigation is carried out, employing large eddy simulations within the OpenFOAM framework. We analyze the flow fields through the spatial variation of density over time. Fast Fourier Transformation and Wavelet Transformation reveal the frequency content from unsteady pressure signals and illustrate its evolution over time under different conditions. Additionally, reduced-order modeling provides a better understanding of the relationship between frequencies and flow structures of the cavity. Results from these analyses demonstrate that top wall confinement increases oscillation frequency, while greater deflection angles introduce Kelvin–Helmholtz instability in the flow field, reducing the frequency. An increase in the Mach number to 2, further intensifies instability, substantially affecting oscillations.

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Effects of multiple subcavities with floor subcavity in supersonic cavity flow

Cited by 3 publications

References 31 publications

Flow control in a confined supersonic cavity flow using subcavity

Flow control in a confined supersonic cavity flow using subcavity

Lagrangian approach for analysis of acoustic energy transport in open cavity flows

Effects of confinement, impinging shock deflection angle, and Mach number on the flow field of a supersonic open cavity

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