Optimization of single obstacle pair for aircraft wake dissipation under crosswind condition

© 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. The implementation of ground based obstacle near the runway threshold has been shown in various simulation, experimental, and ight test studies to be an effective way of reducing the hazard of aircraft wake encounter. These plate-type obstacles functions by accelerating the formation of ground separation based secondary vortex structure (SVS), which wraps around the wake vortex core and induces early dissipation of the wake. Parameter study into the sizing of the obstacle plates has shown that the obstacle can remain effective even with reduced height. However, the effectiveness of these obstacles under crosswind condition is questionable, as previous studies have shown that the maximum descend height of the vortex increases when subjected to crosswind. Large Eddy Simulation (LES) were carried out with vortical Reynolds number of 52,000 using a single obstacle pair of 0:05b0in height. Analysis showed that the effect of obstacle plates on wake vortex dissipation was still observed, though not as pronounced as the no-crosswind case.