Theoretical and experimental investigations of two dimensional flows with separated regions of finite length

Theoretical and experimental investigations of two dimensional incompressible flows containing separated regions of fluid length were conducted. Separation of both laminar and turbulent boundary layers were considered. In the case of laminar separation it was assumed that the separated free shear layer remains laminar. The separation bubbles were originated by backward facing steps with sharp or rounded edges or by dents in a flat plate. The flow along a flat plate having a backward facing step with sharp or rounded edges was generalized to flows in channels with sudden enlargements or to flows in diffusors, respectively. In all cases considered the theoretical modelling of the flow fields has taken into account the strong mutual viscous inviscid interaction between outer flow and separated flow region. All flow problems considered depend essentially on two or more independent Reynolds numbers.