Laminar-Tubulent Transition of Rotating Blasius Boundary Layer. Natural Transition on Low-Pressure Wall.

Numerical studies of bypass transition in the Blasius boundary layer

Experimental findings show that transition from laminar to turbulent flow may occur also if the exponentially growing perturbations, eigensolutions to the linearised disturbance equations, are damped. An alternative non-modal growth mechanism has been recently identified, also based on the linear approximation. This consists of the transient growth of streamwise elongated disturbances, with reg...

Delaying transition in rotating boundary-layer flows

We investigate both the type I and II modes of stationary instability within the boundarylayer flow over a rotating disk. Extending the work of previous studies we find that the flow can be stabilised via the introduction of shear-thinning non-Newtonian fluids. Laminar-flow profiles are determined from a generalised von Kármán similarity solution. An asymptotic study is presented in the limit o...

On the laminar boundary-layer flow over rotating spheroids

Boundary-layer transition on broad cones rotating in an imposed axial flow

We present stability analyses for the boundary-layer flow over broad cones (half-angle ψ > 40◦) rotating in imposed axial flows. Preliminary convective instability analyses are presented that are based on the Orr–Sommerfeld equation for a variety of axial-flow speeds. The results are discussed in terms of the limited existing experimental data and previous stability analyses on related bodies. ...

DNS of Laminar Turbulent Transition in a D Aerodynamics Boundary Layer Flow

Controlled laminar turbulent transition of a D boundary layer ow caused by localized surface nonuniformities is investigated by means of spatial direct numerical simulations DNS based on the complete incompressible D Navier Stokes equations and a combined th order compact Finite Di erence spanwise Fourier spectral scheme The considered laminar spanwise invariant at plate base ow is a model of t...