Detailed study of effects of crosswind and turbulence intensity on aircraft wake-vortex in ground proximity

We present Large-Eddy Simulations of aircraft wake vortices for different crosswind velocities at zero turbulence intensity, and for different turbulence intensities at a crosswind velocity equal to the descent speed of the aircraft wake vortex, to study their impacts on a pair of fully developed wake vortices. The parameters such as circulation, lateral and vertical position of the vortex center, vortex separation distance are investigated with the aid of necessary graphs. Low crosswind velocities are not sufficient to accelerate the decay and push the vortex out of the domain while higher crosswind velocities can intensify the vortex decay earlier and are capable of pushing the downwind vortex out of the flight path. To have a clear understanding of response of wake-vortices for various crosswind velocities, the slope of lateral movement of vortices with respect to time is represented as a function of crosswind velocity. In addition to the movement, the exit time is also formulated mathematically as a function of crosswind velocity. The effect of lower turbulence intensity levels is found to be insignificant while higher levels have a profound influence on the size of the local secondary vortices formed.