![]() Water tunnel experiments on a flat plate at zero angle of attack were performed to investigate the effect of single roughness elements, i.e., trip wires and Hama strips, on the transition to turbulence. Peguero, Charles Henoch, Charles Hrubes, James Fredette, Albert Roberts, Raymond Huyer, Stephen We show that the properties of the optimal perturbations are not significantly affected by the choice of the base profile, whereas it has a more important impact on their evolution in the nonlinear regime.Flat Plate Boundary Layer Stimulation Using Trip Wires and Hama Strips To assess the influence of the boundary layer development, we consider both a constant Blasius base flow profile and a growing base profile. We also perform direct numerical simulations to examine how the optimal perturbations evolve in the nonlinear regime. We compute the optimal perturbations using non-modal theory and perform a parametric study to measure the influence of the magnetic field on their amplification and orientation with respect to the flow direction. In this work, we consider the effect on the transient growth of a spanwise magnetic field in a boundary layer flow of a liquid metal over an electrically insulating flat plate. In this context, the computation of the perturbations that exhibit the largest possible transient growth is of central interest as it often sheds light on the actual bypass transition route. Many shear flows exhibit laminar to turbulent transitions at subcritical Reynolds numbers.
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