WebJan 11, 2015 · Roughness elements in laminar boundary layers generate both high shear layers and streaky structures. Because these phenomena interact, it is difficult to … Web2 days ago · Dynamic hump is an active control method, which has been proved to be able to suppress laminar flow separation on the suction surface of high-loaded low-pressure turbine (LPT) blades at low ...
Stability of the laminar boundary-layer flow behind a …
WebApr 28, 2016 · Large elements are capable of immediately tripping turbulent flow by either a strong, purely convective or an absolute/global instability in the near wake. First we … WebJul 29, 2024 · In fact, the flow separates all along the span behind the densely packed roughness and exhibits a transition behaviour similar to that of the flow behind a 2D … early brendan fraser
Compressibility Effects on Boundary-Layer Transition Induced by …
WebNov 1, 2016 · It is shown that flow turbulization behind the roughness elements occurs at the local Reynolds number calculated on the basis of the roughness element height and equal to 400–500. Roughness elements in laminar boundary layers generate both high shear layers and streaky structures. Because these phenomena interact, it is difficult to precisely ascertain the dominant instability mechanisms. With the goal of explicating such interactions, we study the stability of a laminar boundary layer … See more Figures 3 and 4 compare numerical results with experimental results. Figure 3 presents comparisons in wall-normal direction, and Fig. 4 presents corresponding … See more By definition, LST ignores nonlinear interactions, in which case eigenmodes act independently. In reality, modes interact in complex ways to influence stability and transition. Thus, experiments reveal phenomena … See more To study the development of perturbation amplitudes in streamwise direction, theoretical amplitudes were scaled by their respective e^N-factors from LST: Integration of the … See more WebAug 16, 2008 · As compared to the upwind element and the single element in Figure 6a, the “pinching in” of the wake in the vicinity of the reattachment point is absent behind the second roughness element. These patterns persist when additional roughness elements are added to the rectangular array, expanding the span-wise extent . css web form templates