Meunier, P., Ehrenstein, U., Leweke, T. and Rossi, M. (2002) A Merging Criterion for Two-Dimensional Co-Rotating Vortices. Physics of Fluids, 14, 2757-2766.
ABSTRACT: The near-field dynamics of an aircraft wake is studied by means of temporal large-eddy simulations, with and without considering the effect of engine jets. In the absence of jets, the simulations showed the roll-up of the initial vorticity sheet shed by the wing and the occurrence of short-wavelength instability in a pair of primary co-rotating vortices. The main consequence of the instability is the modification of the internal structure of the vortex, compared to the two-dimensional stable behavior. The presence of engine jets affects the roll-up of the vorticity sheet and causes an enlargement of the final merged vortex core compared to the case without jets.