Análise computacional do escoamento sobre uma aeronave otimizada em escala reduzida.

Abstract

This work aimed to analyze the flow through an aircraft designed by the ParahyAsas team, keeping in mind its main aerodynamic elements: wing, wingtips(endplates and winglets) and the fuselage. The objective here is to determinate the main aerodynamic parameters (CL, CD and CM), so as to analyze the influency over these parameters and the whole flow behaviour of wingtips with different geometries and of the positioning of the fuselage in relation to the wing. To solve the cases, the finit volume method has been used with the grid, the especification of the cases, the numerical processing and the later treatment of the obtained solutions, all them develop in a well known commercial code (CFX softwares - ICEM-CFD, Pre, Solver and Post). The turbulence was treated with the RNG k-å model, choice motivated by the wide turbulence spectra, the boundary layer characteristics over the aircraft, with separation and several tridimensional effects, the downwash region and the vortex generation. The convergence criterion of the solutions was the invariance of the forces over the analysed bodies, so as of the pressure distribution, having as the convergence parameter of the problem governing equations the residual error of the order of 10-8.