A comparison of five different spatial discretization schemes is performed considering a typical high speed flow application. Flowfields are simulated using the 2-D Euler equations, discretized in a cell-centered finite volume procedure on unstructured triangular meshes. The algorithms studied include a central difference-type scheme, and 1st-and 2nd-order van Leer and Liou flux-vector splitting schemes. These methods are implemented in an efficient, edge-based, unstructured grid procedure which allows for adaptive mesh refinement based on flow property gradients. Details of the unstructured grid implementation of the methods are presented together with a discussion of the data structure and of the adaptive refinement strategy. The application of interest is the cold gas flow through a typical hypersonic inlet. Results for different entrance Mach numbers and mesh topologies are discussed in order to assess the comparative performance of the various spatial discretization schemes.
A análise de estabilidade representa um dos pontos mais complexos do projeto de uma aeronave. Esse trabalho discute métodos computacionais que determinam os principais dados preliminares de estabilidade. Durante a fase preliminar do projeto de uma aeronave, as dimensões das superficies horizontal e vertical da empenagem, assim como a determinação da posição do centro de gravidade, devem ser suficientes para garantir a estabilidade e o controle. Para os estudos deste projeto utilizou-se as características de um modelo 3D e comparou-se os resultados computacionais com o real. O objetivo é provar a eficácia de um método mais rápito e econômico no desenvolvimento do design preliminar de uma aeronave, determinando sua geometria através do programa computacional DATCOM (Data Compendium), do software MATBLAB e do software CATIA V5 como suporte de projeto.
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