Vortex Flow Analysis Essay
Vortex flow analysis and development of vortex core decay mechanisms has been an active research area in the recent era of aviation research. The vortices especially the wake vortex pairs encountered on commercial airport runways are primary importance due their direct relation with operational efficiency of the airport and safety issue concerning succeeding aircrafts. The probability of encountering a wake vortex pair shed by a preceding aircraft is high at ground proximity[6]. The reason for this high probability rate is due to constrained motion of vortex-pair in terms of descent area near ground proximity[7].
Further the presence of cross wind flows in the flight corridor has different effects on upwind and downwind vortices. The downwind
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Turbulence induced by an aircraft is taken into account in the present study by introducing periodic perturbations in the spatial direction, a random three dimensional perturbation can be added into the swirl flow to induce turbulence and initiate vortex core decay but in order to study the effect of specific perturbations and to optimize the required mesh resolution we use periodic perturbations coupled with periodic wall boundaries.
Flow turbulence is characterized in terms of observed properties and these we consider the following properties of flow turbulence in order to model effects of different perturbation in generating flow turbulence. The important properties are Turbulence has spatial and temporal complexity
At high Reynolds numbers, flows described by Navier Stokes equations display sensitivity to disturbances. Flow turbulence is the response to such disturbances, with high complexity that its behavior is considered stochastic. It can maintain this chaotic state in the absence of new disturbances. This nature of turbulence flows is used to delay the separation of boundary layer in adverse pressure gradients in the
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