Large-eddy simulations of pairs of artificially generated longitudinal vortices embedded in a two-dimensional turbulent boundary layer are performed to study the dynamics of the vortical structures and to provide the unsteady inflow data for use in a future turbomachinery simulation. An immersed boundarymethod is employed to represent the wall-mounted half-delta wings that generate the counter-...

Starting flow through a nozzle or orifice typically results in the transient formation of a leading vortex ring and trailing jet. Experiments are conducted to investigate the dynamics of this process in the case of a temporally variable nozzle exit diameter, with the aim of understanding these flows as they occur in Nature and emerging technologies. By kinematically decoupling the source flow f...

Vortex Generators (VGs) are applied before the expected region of separation boundary layer in order to delay or remove flow separation. Although their height is usually similar that layer, some applications, lower VGs used, Sub-Boundary Layer (SBVGs), since this reduces drag coefficient. Numerical simulations sub-boundary vane-type vortex generators on a flat plate negligible pressure gradient...

A numerical simulation is performed to study the effect of two types vortex generators (VGs) on heat transfer coefficient and pressure drop in duct. There are V.G., one concave V.G. other rectangular. The aim observe effects shape arrangement this V.Gs channel increase with Reynolds number range from (300 1500). Both were placed 45o angle attack, an line staggered position. results shows that p...

The effect of streamwise plasma vortex generators on the convective heat transfer a turbulent boundary layer is experimentally investigated. A Dielectric Barrier Discharge (DBD) plasma-actuator array employed to promote pairs counter-rotating, streamwise-aligned vortices embedded in well-behaved over flat plate. study aims at elucidating mechanism interaction between plasma-induced vortical str...