Modal decomposition of turbulent supersonic cavity

Self-sustained oscillations in a Mach 3 supersonic cavity with a length-to-depth ratio of three are investigated using wall-modeled large eddy simulation methodology for Re D = 3.39 × 10 5 . The unsteady data obtained through computation are utilized to investigate the spatial and temporal evolution...

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Bibliographic Details
Published in:Shock waves 2019-01, Vol.29 (1), p.135-151
Main Authors: Soni, R. K., Arya, N., De, A.
Format: Article
Language:English
Subjects:
Acoustics
Computational fluid dynamics
Computer simulation
Condensed Matter Physics
Decomposition
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Fluid flow
Fluid- and Aerodynamics
Heat and Mass Transfer
Large eddy simulation
Original Article
Proper Orthogonal Decomposition
Simulation
Tensors
Thermodynamics
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Summary:Self-sustained oscillations in a Mach 3 supersonic cavity with a length-to-depth ratio of three are investigated using wall-modeled large eddy simulation methodology for Re D = 3.39 × 10 5 . The unsteady data obtained through computation are utilized to investigate the spatial and temporal evolution of the flow field, especially the second invariant of the velocity tensor, while the phase-averaged data are analyzed over a feedback cycle to study the spatial structures. This analysis is accompanied by the proper orthogonal decomposition (POD) data, which reveals the presence of discrete vortices along the shear layer. The POD analysis is performed in both the spanwise and streamwise planes to extract the coherence in flow structures. Finally, dynamic mode decomposition is performed on the data sequence to obtain the dynamic information and deeper insight into the self-sustained mechanism.
ISSN:0938-1287
1432-2153
DOI:10.1007/s00193-018-0836-y