Wake vortices behavior near the ground
Department of Fluid Mechanics CERFACS, 42 G. Coriolis Ave, F-31057 Toulouse Cedex, France
Direct numerical simulations of a vortex pair embedded in a stable atmospheric boundary layer are presented. The effects of various crosswind conditions are studied. These computations demonstrate the creation of secondary vortices for the range of Reynolds numbers (3770≤Rer≤). The physics of wake vortex interactions with the ground for different values of crosswind are discussed. The redistribution of vorticity between the atmospheric boundary layer and the vorticity induced by the primary vortices may explain the vortex tilting phenomenon. A parametrization of the effect of crosswind on the minimum altitude reached by the two vortices is given.
© EDP Sciences, ESAIM, 1996