Applications of Direct Numerical Simulations (DNS), Large-Eddy Simulation (LES), and Unsteady Reynolds-Averaged Navier Stokes (URANS) calculations for the investigation of transitional and turbulent wall-bounded shear flows are discussed. An example of DNS is an investigation of a wall jet. As an example for LES, results of an investigation of a subharmonic-type breakdown transition process are presented and discussed. These results indicate that LES may become a valuable tool for investigating the later stages of the transition process, particularly the initial stages of the random motion. As an example of a URANS application, results for a periodically forced turbulent wall jet are discussed.
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