Numerical Simulation of Transition and Turbulence in Wall-Bounded Shear Flow
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Laminar-turbulent transition encompasses the evolution of a flow from an initially ordered laminar motion into the chaotic turbulent state. Transition is important in a variety of technical applications, however its accurate prediction and the involved physical mechanisms are still a matter of active research.
In the present contribution, an overview is given on recent advances with the simulation of transitional and turbulent incompressible wall-bounded shear flows. The focus is on large-eddy simulations (LES). In LES, only the large-scale, energy-carrying vortices of the flow are accurately resolved on the numerical grid, whereas the small-scale fluctuations, assumed to be more homogeneous, are treated by a subgrid-scale (SGS) model. The application of LES to flows of technical interest is promising as LES provides reasonable accuracy at significantly reduced computational cost compared to fully-resolved direct numerical simulations (DNS). Nevertheless, LES of practical flows still require massive computational resources and the use of supercomputer facilities.
KeywordsDirect Numerical Simulation Direct Numerical Simulation Data Smagorinsky Model Hairpin Vortex Bypass Transition
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