Opposition control of artificially initiated turbulent spots in a laminar boundary layer was carried out low-turbulence wind tunnel with the aim to delay transition turbulence by modifying structure within spots. The timing and duration control, which using wall-normal jets from spanwise slot, were pre-determined based on baseline measurements transitional layer. results indicated that high-spe...

in this paper, the accuracy of k- and k- turbulence models in super sonic boundary layer capturing of smooth/rough flat plates have been comprehensively investigated. among these investigations, some sorts of sensitivity analysis, including change in turbulence model, generated-grid density, near wall affects, c magnitude (for boundary layers generated on smooth flat plates), and change in c...

this work presents free vibration analysis of laminated rectangular plates with classical boundary conditions based on the classical plate theory (cpt). the first involves an s-fgm plate with different boundary conditions. then involves a two-layer plate in which an s-fgm layer is coated on a homogeneous substrate with classical boundary conditions, simply called an s-fgm-coated plate; the othe...

We examine enclosed swirling transitional and turbulent flows in a cylindrical vessel, driven by a single rotating endwall. The cylinder height:radius ratio H/R = 1 was chosen explicitly to preclude the possibility of vortex breakdown on the cylinder axis, thus concentrating attention on the behaviour of the cylindrical sidewall boundary layers. Over a range of Reynolds numbers above Re = ΩR2/ν...

This thesis presents a high-order Implicit Large-Eddy Simulation (ILES) approach for simulating transitional aerodynamic flows. The approach consists of a hybridized Discontinuous Galerkin (DG) method for the discretization of the Navier-Stokes (NS) equations and a parallel preconditioned Newton-GMRES solver for the resulting nonlinear system of equations. The combination of hybridized DG metho...

A combined numerical-experimental investigation is presented with focus on the effects of boundary-layer instabilities and transition wall cooling performance in a Mach 5 low-enthalpy flow over flat plate, coolant injection achieved through row slots. The numerical study has been performed direct simulation (DNS) compressible Navier-Stokes equations, supported by results from linear stability a...