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ABSTRACT
Low frequency dynamics of shock–turbulence interactions in constant area pipe flow with centre-line Mach number of 1.7 and friction Reynolds number of 245 is analysed using dynamic mode decomposition (DMD) of well-resolved large eddy simulation (LES) data. Two flow cases – one with a shock train and the other without shocks – are analysed. The dominant DMD modes show the near-wall sweep-ejection activity especially for the flow without shocks and also show the influence of the shocks on the near-wall organisation of the flow. The DMD modes also demonstrate a reasonable correlation between the near-wall coherent structures and the shock train for some of the modes.
Disclosure statement
No potential conflict of interest was reported by the authors.
Additional information
Funding
The authors thank Science and Engineering Research Board, a statutory body under the Department of Science and Technology, Government of India, for providing the funding for carrying out this research through project no. EMR/2016/005170.