| Summary: | This work presents a comprehensive study of aircraft wake vortex decay analysis in
ground proximity using Large Eddy Simulation (LES). An in-house FORTRAN
code named Jetcode was used to analyze the vortex decay parameters. Parametric
investigations were performed on three different mesh configurations and using
various periodic perturbation functions on single vortex flows for estimation and
reduction of simulation time and computation resources requirements. Perturbations
were introduced into the vortex flows to accelerate the vortex decay process and
periodic functions were used to systematically initiate flow turbulence, which is
generally known for its chaotic origins.
Appreciable parameter combinations were applied to counter rotating aircraft wake vortex
model to investigate the vortex decay characteristics in the wake flow.
Several vortex characteristics like circulation strength, vortex center displacement,
lateral and vertical movement of the vortex and vortex core radius variation were
analyzed. In order to understand the applicability of Sub Grid Scale (SGS) models
to the vortex flow analysis detailed studies of Smagorinsky and Dynamic
Smagorinsky models were performed. The effectiveness of the SGS models to
compute the energy transfer between the grid scales and sub grid scales was
visualized by analyzing the eddy viscosity dissipation among the scales of motion
for different flow conditions.
Beside the investigation of wake vortex decay acceleration, the study also aims at
optimizing the mesh resolution required for vortex flow analysis in the ground
proximity.
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