Large Eddy Simulations of Turbulent Mixing Layers Excited with Two Frequencies

• Published in: Flow, turbulence and combustion Vol. 92; no. 3; pp. 651 - 671
• Main Authors: Sarkar, Abhishek, Schlüter, Jörg
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.03.2014; Springer
• Subjects: Automotive Engineering; Energy transfer; Engineering; Engineering Fluid Dynamics; Engineering Thermodynamics; Exact sciences and technology; Excitation; Fluid dynamics; Fluid flow; Fluid- and Aerodynamics; Fundamental areas of phenomenology (including applications); Heat and Mass Transfer; Physics; Thick shear flows; Turbulence; Turbulence simulation and modeling; Turbulent flow; Turbulent flows, convection, and heat transfer; Turbulent mixing; Vortices; Coherent structures; Large Eddy Simulation; Tubulent mixing layer; Backscatter; Turbulent flow; Energy spectra; Digital simulation; Boundary conditions; Vortex pair; Mixing layer; Large eddy simulation; Vorticity; Modelling; Turbulence structure
• ISSN: 1386-6184; 1573-1987
• DOI: 10.1007/s10494-013-9507-3

In this study, we investigate the energy transfer during the pairing and merging process of two vortices into one in an excited turbulent mixing layer using Large Eddy Simulations. We present simulations of natural and periodically excited mixing layers for validation purposes and study the vortex pairing dynamics by exciting the mixing layer by two frequencies. The results help in understanding the effects of the energy transfer in the long-wave turbulent spectrum and assessing the role of backscatter.