Date of Award

Summer 1999

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Aerospace Engineering

Committee Director

Osama A. Kandil

Committee Member

Oktay Baysal

Committee Member

Colin P. Britcher

Call Number for Print

Special Collections; LD4331.E535 T87

Abstract

An adaptive and dynamic grid approach is developed for the numerical computations of wake vortex flow problems with ground interaction. The unnecessary grid points at the far field of the original, large, single zone grid are removed for computational efficiency. Next, the grid is modified into an adaptive one, where the fine core region keeps track of the vortices and can be split into two regions when the vortex separation distance exceeds a specified limit length. In the final step a multi zonal feature is added to this grid by means of two embedded grids placed at the vortex centers and the excess numerical dissipation at the initial stages of the computation due to the insufficient grid resolution is alleviated. Also continuous and automated simulation algorithms are developed for these grids in order to eliminate the user interaction during the computation. Four laminar 2D cases are investigated, by using a model wake vortex problem, with the grids of the three steps mentioned above including the original, large, single zone grid. The results are compared with each other to analyze the effects of these improvements and validated with available field measurements. Finally two laminar 3D cases are investigated with the single zone and multi-zone adaptive grids. Here the effects of the third dimension and multi-zonal approach are investigated. Also these 3D results are validated with the field measurements and compared with the corresponding 2D results.

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DOI

10.25777/rpk4-g143

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