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Development of a Viscous Vortex/Wing Interaction Program for Thick Wings with Rounded Leading Edge.

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Final rept.,

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A hybrid viscouspotential flow program was developed to analyze the flow field on and around a swept thick wing with rounded leading edges and leading edge vortex flow. The program provides a computational package which includes four major programs run with proper interfacing in an iterative cycle. These programs include two viscous programs and two potential flow programs. The viscous flow programs consist of 1 a parabolic solution to the Navier-Stokes vorticity equation in a box around the leading edge vortex and 2 a three-dimensional second-order boundary layer program for infinite yawed wings. This program provides the boundary layer vorticity being fed into the vortex box. The two potential flow programs are 1 the Hess surface singularity method for thick wings and fuselage combination and 2 a vortex lattice method to model the leading edge vortex. These two programs provide the surface pressures and the viscous box boundary velocities. The program interfaces are developed by applying the concept to a 65 deg delta wing with a spanwise variation in leading edge radius. Operating experience is presented, giving the results and knowledge gained in each cycle of the iterations. The method allows the designer to design or modify the leading edge shape to meet the desired performance and control requirements.

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  • Computer Programming and Software
  • Fluid Mechanics

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