STUDY OF LARGE-SCALE DYNAMICS EMANATED IN COMPLEX TURBUBLENT FLOWS

The study of turbulence developing close to solid walls, usually referred to as wall turbulence is one of the most important aspects of turbulence. In this study, large-scale dynamics in the turbulent wall shear flows are investigated, where the vortex motion such as the hairpin packet formation organization and ramifications of the organization of coherent structure is essential. Using spatially evolving direct numerical simulations, the large-scale dynamics of wall turbulence emanation is studied. The dynamics attributes to the new and even older hierarchy unstable structures generated by the lifted-up low-speed streaks.