Wing-tip vortex dynamics at moderate Reynolds numbers

The flow over a flat-tipped wing at three Reynolds numbers: R e = 1 × 10 4 , 4, and 5 is investigated using direct numerical simulation. A set of grid independent results are obtained which allow for the dynamics tip flow, trailing vortices, their interplay with boundary layer to be examined in detail. show significant changes across number range. At lowest number, single vortex forms downstream edge, whereas multiple vortices form higher numbers. geometry shown important regard development different structures transition from laminar turbulent. This due unstable shear layers, turbulent becoming entrained cores These changing mean that value minimum core pressure its location change number. has consequences cavitation inception scaling hydrodynamic applications. influence on further considered by comparing an infinite-span wing. Analysis two cases shows reduces effective angle attack, prevents separation leading edge responsible case. This, turn, character would have noise.