Dynamic mode decomposition of supersonic turbulent pipe flow with and without shock train

• Published in: Journal of turbulence Vol. 21; no. 1; pp. 1 - 16
• Main Authors: Srinivasan, G., Mahapatra, Susila, Sinhamahapatra, Kalyan P., Ghosh, Somnath
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 02-01-2020
• Subjects: dynamic mode decomposition (DMD); Turbulent pipe flows
• ISSN: 1468-5248; 1468-5248
• DOI: 10.1080/14685248.2019.1710517

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.